March 14, 2025, 08:01:53 PM

Author Topic: 403 LS2 FD - LS7 Build for 2020!  (Read 278720 times)

Offline MPbdy

Re: 403 LS2 FD - LS7 Build for 2020!
« Reply #810 on: May 21, 2020, 06:18:44 PM »
MAP is up in the front.

Compared to your LS1 I'm a 226/242 on 117 cam with ~15% more displacement and a 4" stroke vs 3.622 all heavily working against me carrying power up top.  To spin 7000 and actually make power in a 402 I'd need more like a 236-242 intake lobe and the LS7 is getting a 258 solid roller lobe so I can get up to 7500+.

Peak torque way back when I dyno'd it originally was flat from 4600-5100.  Peak power was flat from 5800-6100.  Power dropped from 468 to 450 by 6500, and fell harder above 6500.  The setup for those dyno numbers was 100% stock ls3 heads and intake, and 2.25" outlet log style exhaust manifolds into dual 2.5" to the bumper. 4.10 gears through the mazda diff.  All things considered, it really isn't bad. It isn't the dream motor anymore, but it has lived up to over 20,000 miles of abuse and would probably keep going another 20 if I wasn't building the ls7.

It definitely draws a lot of criticism on the web for not being a dyno hero, but it does a lot better than the numbers make it sound.  It offers a ton of usable power while keeping a high level of stealth and civility for California driving.

Since that dyno day, I added kooks green cats, put a "rod mod" ls3 intake on it, and now I've tweaked a few other things recently on the engine.  The car now has 3.90 gears in a Ford 8.8 so I don't know how that'll affect it either.

Throwing the headers on, taking the cats off and getting back on the dyno is going to be real exciting.  It never ran nearly as hard after putting cats on it, and longtubes should really help it breathe.  I'm keeping the dual 2.5" for now using a cone reducer to go from the 3" collector to the 2.5" x-pipe.  The LS7 will need dual 3" and that is a problem for another day.

Offline Exidous

Re: 403 LS2 FD - LS7 Build for 2020!
« Reply #811 on: May 22, 2020, 12:02:03 AM »
That's quite the split on the cam. Are the exhaust ports on the LS3 really that small? Most LS7 cams are in the 12* split or so. Before my valvetrain issues my LS7 was pulling hard to 7k but I don't have a dyno graph. That was supposed to be the following week. The cam is a 228/240-118+4. I'm sure a ported MSD intake would help but that will have to be for another time. I'll be stepping up to a 434ci "while I'm in there". Could easily go 440 for an 0$ extra but want to leave a couple hones in the sleeves. These ones can go to a max of 4.2".

As long as the car it fun to you, that's all that really matters. Dyno nets be damned. Ha

You should check out my muffler. Long tubes merged to a 3.5" single. It sounded freaking incredible and stock quiet when closed. ZERO drone anywhere. Oh and it would shoot flames. NBD
94 BB Sleeved gen IV LS7, MS3ProU with TC, RONIN 8.8 and LT's with custom 3.5"single to VAREX muffler.

Offline MPbdy

Re: 403 LS2 FD - LS7 Build for 2020!
« Reply #812 on: May 22, 2020, 01:10:23 AM »
The thought with the cam was that it had minimal overlap 0* at .050”, and extra exhaust duration to hopefully bandaid the restricted exhaust on the car. I don’t think it’s been a bad choice, but again not setting records. Going to be real curious what the dyno curve looks like after the headers.

I used to spit fireballs too. The real motivator to ditch the cats and put the headers on is to get the sound and fireballs back haha. It’s a much more cackley idle and ragged sound without the cats, and fire is cool.

Offline MPbdy

Re: 403 LS2 FD - LS7 Build for 2020!
« Reply #813 on: May 25, 2020, 06:32:04 PM »
Wow! What a wild couple of days.  I really didn't think we'd pull this one together, but we started Saturday morning and got the car wrapped up by 10 pm yesterday and home by 11.

Shirley and my dad busted ass (and knuckles lol) with me all weekend to get the new wheels and tires mounted, the DSS pro axles in, and the headers installed.  I didn't think about needing O2 extensions so I drove the car home an hour in open loop mode lol.  My tune wasn't half bad.  The car leaned out a lot in PE which is always a good sign.

The headers sound wild!  It is just as quiet if not quieter than before at light load which is a big surprise to me.  I thought it was going to get obnoxious.  It doesn't drone either.  Getting on it, the thing is vicious.  It sounds amazing and I can't wait to be able to get a closed loop tune flashed into it and start playing around with it for real.  I also need to add some fuel in decel so I can get some fire going again :D

Once it is ready I'm going to take it to Church here in Socal for a dyno and street tune.  He did my buddy's C5 with an LS3 and it ran great.  I've always done all the tuning myself, even the couple times I've had it on a dyno.  I'm really looking forward to the dyno day.

Got my co-pilot :) The new mom car was packed full of 275's and Weds haha







When we were doing the trans I found a ton of grease in the right rear of the car.  I had already snatched up previously some Cobra style DSS pro axles on clearance from J-Auto.  I guess everyone is using explorers now so they make the inner stubs with the larger sealing surface.  The splines however are the same as the Cobra, and with a simple seal swap you can run mustang axles in the explorer housing.  Saved 40% on these guys brand new which is awesome.  I was seeing a future scenario where I had axles with FD outer CV's and Mustang inner tripods, and potentially no way to get new ones of either if I had a problem.  I've also always hated the sloppy Ford tripods.  Just lame engineering.  These Porsche CV's are super nice.





New wheel bearings installed with the larger hubs and fresh ARP lugs to work with the new axles.





They look damn good in there! Sexy with all the upgraded suspension arms too.  Never thought I'd go down that route, but now I'm a diehard advocate.  Bushings suck - heim joints for the win.



Listed the old wheels and tires for sale and they were gone in less than 24 hours.  Years of driving and not even a scratch.  Pretty proud of that haha. 



The new wheels are just ridiculously awesome.  Had them machine road force balanced which is not a cheap exercise, but they're glass smooth.  Two of the tires needed to be dismounted and rotated 20* and 30* to better match the wheels.  Definitely feels ready for 200 mph :)



Out with the old, in with the new.  I got the final set of 1 7/8" merge headers from Spoolin' on his close-out sale.  They've been sitting under a bed for years lol.  If I didn't have these I'd have a set of Ronin's for sure.  They do fit nice though - didn't need to clearance anything.  I have a solid 1/4" to the nearest interference anywhere.  They're beautiful now, but I am 100% positive I will be banging them off the ground at some point in the near future.  Hell, my oilpan has scrapes and the headers are about an inch lower than that..  At least the new tires raised the car up a bit.







I'm really proud of the little garage that we've setup at our condo, but I had to call in the big guns for this project.



Aaaand when you finish super late and there's no light left you don't get sexy pictures of the finished product.




We got home, shared a beer, and then all but collapsed.  I am very grateful for having the day off today.  These pics of the car in the garage represent so much work over the past month or so that I can't even keep track of all that was done. 

These past weeks pale in comparison to guys like Blake building entire cars seemingly overnight with custom electronics, custom interior and fabricated parts out of thin air, but as you can tell from the dates in the build thread things tend to take a little extra time around here lol.  This has been literal years of parts piling up and I'm just incredibly proud of what has been accomplished so quickly.  This car has become an absolute monster of a performance car.  It is nothing I'd ever be able to replicate starting over from scratch.  It has taken over 10 years to get here.  I can't express how happy I am to be able to own this car, and continue building my ever changing dream car out of it with some incredibly awesome people in my life.   

And I mean, can we talk about that fitment?  275 slicks on a street car? :bacon: :bacon: :bacon:




Offline Exidous

Re: 403 LS2 FD - LS7 Build for 2020!
« Reply #814 on: May 25, 2020, 07:02:57 PM »
What are the wheel specs? Looks great.

How's that ls7 coming? Lol
94 BB Sleeved gen IV LS7, MS3ProU with TC, RONIN 8.8 and LT's with custom 3.5"single to VAREX muffler.

Offline MPbdy

Re: 403 LS2 FD - LS7 Build for 2020!
« Reply #815 on: May 25, 2020, 07:28:37 PM »
What are the wheel specs? Looks great.

How's that ls7 coming? Lol

18x9.5 +45 square and the tires are 275/35/18. The rear has a 12mm spacer. I need a tad more camber it just barely rubbed a bit in the back.

The ls7 is next in line after the car gets tuned. I’d like to get as much ready as possible now and then just have to drop the engine in. Everything needed to get done for the new engine just mixed up the order of things a little bit haha.




Offline Exidous

Re: 403 LS2 FD - LS7 Build for 2020!
« Reply #816 on: May 25, 2020, 07:41:25 PM »
I'm curious about getting a different engine tuned prior to the LS7. The square port heads and intake are going to change a lot.
94 BB Sleeved gen IV LS7, MS3ProU with TC, RONIN 8.8 and LT's with custom 3.5"single to VAREX muffler.

Offline MPbdy

Re: 403 LS2 FD - LS7 Build for 2020!
« Reply #817 on: May 25, 2020, 10:58:07 PM »
I'm curious about getting a different engine tuned prior to the LS7. The square port heads and intake are going to change a lot.

There’s still a lot of time and money needed for the ls7, and it’ll get a Holley anyways. I’m still using and enjoying the car in the meantime. The ls7 has already been going on 2 years lol.

Quarantine derailed the engine build a little bit, but all that work is going toward the end product. I just want to see what this combo makes before swapping engines haha.

Offline largeorangefont

Re: 403 LS2 FD - LS7 Build for 2020!
« Reply #818 on: May 26, 2020, 01:04:07 AM »
Damn that came out nice!
Quote from: cool
Sell it to spacevomit.  He'll finish it.

Offline kinger

Re: 403 LS2 FD - LS7 Build for 2020!
« Reply #819 on: May 26, 2020, 11:27:13 AM »
Wheels look sick!  Have you tried NT01 compared to Maxxis?  How many miles do you get on the maxxis roughly?

That is a ton of work and totally agree with you things happen slow in these parts LOL  I was happy to get trans RnR in 4 days.  Some of these guys do that in a morning, and replace the engine in the afternoon and drive it work the next day! 
93 Touring, 6.3L, T56 Magnum, Mamo RPS BC2 clutch, FAST 90, NW 90TB TB, 8.8, samberg everything, AC, PS, TC, Cruise, LED Tails, HID head lights

Offline MPbdy

Re: 403 LS2 FD - LS7 Build for 2020!
« Reply #820 on: May 26, 2020, 12:12:04 PM »
I know LOF has used both.  The Maxxis are the best street tire I've ever run if you can 100% avoid rain at all costs.  California doesn't have any unplanned rainfall lol.  Because they don't have any tread pattern they're incredibly smooth and quiet.  They also wear super well.  I ran the last set for 2 years hard on the street and they weren't even to the wear bars, and they were still sticky.  I didn't do any track days, but it is definitely a characteristic of these to last a very long time.

Offline Cobranut

Re: 403 LS2 FD - LS7 Build for 2020!
« Reply #821 on: May 26, 2020, 01:08:22 PM »
Good to hear on the Maxxis tires.   I'm strongly considering those for my racecar. 👌
1995 FD, 7.0 Liter stroked LS3, T56, 8.8, Samberg kit.

Offline largeorangefont

Re: 403 LS2 FD - LS7 Build for 2020!
« Reply #822 on: May 26, 2020, 01:29:37 PM »
Wheels look sick!  Have you tried NT01 compared to Maxxis?  How many miles do you get on the maxxis roughly?

That is a ton of work and totally agree with you things happen slow in these parts LOL  I was happy to get trans RnR in 4 days.  Some of these guys do that in a morning, and replace the engine in the afternoon and drive it work the next day! 

The wear is similar between the 2. If you are street driving do the NT01, at least you have a little tread to handle a little water. The RC1 will instantly hydroplane above 25-30 MPH in any standing water condition. NT01 is better but not by much.

Both ride well and aren’t overly noisy. When they are up to temp on a track the NT01s can be slid and overdriven a bit. The RC1s don’t like to be over driven.

I have not yet tried the new Maxxis RC1 compound though. I have heard it can withstand a bit more temp.
Quote from: cool
Sell it to spacevomit.  He'll finish it.

Offline MPbdy

Re: 403 LS2 FD - LS7 Build for 2020!
« Reply #823 on: May 26, 2020, 01:56:39 PM »
Counter point, if you want to be rain worthy you'd be replacing NT01's long before their useful tread is gone.  I did drive my r888's in the rain back in the day though so it is nice to have the option.

RE71-R's in less than a year were too sketchy to drive in the rain too.  They were the worst wearing tire I've ever used.  Wore like pencil erasers.  They did not handle high power, and after a couple rotations the tread was gone and they camber wore like a bitch too compared to the R comps.

Neither NT01 or RC1's will be the fastest tire from what I understand, but are good street/canyon/track day tires.  Not going to set record lap times, or be the best for competition if the tire choice is open.

http://racetrackdriving.com/tech/tire-review/r-compound-tire-hierarchy/

I'm not sure if this is still valid as it is 3-4 years old now, but some helpful rankings for race tires.
« Last Edit: May 26, 2020, 02:07:07 PM by MPbdy »

Offline MPbdy

Re: 403 LS2 FD - LS7 Build for 2020!
« Reply #824 on: May 31, 2020, 01:26:46 AM »
Well, pretty exciting and fun day. Might’ve been a little frivolous to do the tune before an engine swap lol but now I’ve got a real good baseline for the ls7 to compare against. The thing cranked out 511/509 with minimal correction factor. Stock c6z’s dyno ~460 here.

It’s hard to tell objectively how much faster it is than before, but I did get a chance to ride passenger and it’s quite an animal. My butt dyno is a little numb from the driver seat, but riding passenger always gives some perspective. Part throttle and under the curve it’s never been this strong and it noticeably carries better past hp peak to 7000.

The headers and I suspect maybe the pushrods have helped it carry power higher than before. Power gains are 43 hp and 58 ft lb from my previous best with the exhaust manifolds. It ran 11.2 at 129.85 at Fontana in the summer with 468whp, so it ought to rip now. I’ve been 11 teens on street tires and it definitely feels like I could drive it off the line to a 10.9x right now on the right day.

It’s nice to have everything working on the car again. Good foundation to throw a crap ton more power to it. It grips first gear right now with the fresh slicks so I’ve got some headroom to get after it! Very excited for the next step.

Ls7 updates soon I promise :p

https://www.instagram.com/p/CA1EDISHqj7/?igshid=1q68zny85gjd9