February 19, 2025, 03:48:41 PM

Author Topic: UK RHD LS1 8.8 FD Gunnytron's build thread  (Read 252044 times)

Offline bimbleuk

Re: UK RHD LS1 8.8 FD Gunnytron's build thread
« Reply #150 on: January 27, 2014, 02:34:39 PM »
I got inspired by the Drift works AE86 build and ordered some Jenvey ITBs.

Now think of the work you put in to your airbox x2 on top of the EFI Live mapping :-)

Offline Gunnytron

Re: UK RHD LS1 8.8 FD Gunnytron's build thread
« Reply #151 on: January 27, 2014, 03:02:33 PM »
I got inspired by the Drift works AE86 build and ordered some Jenvey ITBs.

Now think of the work you put in to your airbox x2 on top of the EFI Live mapping :-)

Just checked that 86 out, looks and sounds awesome. Never looked at ITBs before. You get much of a power gain? you intending to cut your bonnet or squeeze it under?
http://www.norotors.com/index.php?topic=12880.0
FD, LS1 running 220 3.90 Trickflow heads, Comp Ultra-gold Arc 1.72 Rockers, 7.550 BTR Pushrods, BTR Stage II NA Cam 227/234 .614"/.576" 113+2, ARP Head Bolts, BTR Platinum Springs, Ported FAST 90, NW 90mm TB, FAST 60lb Injectors, Textralia Clutch/Flywheel, T56, Cobra 8.8, 31 spline, trac-loc 3.55 Diff, Holley HP EFI, Racelogic TC.

Offline bimbleuk

Re: UK RHD LS1 8.8 FD Gunnytron's build thread
« Reply #152 on: January 27, 2014, 08:50:20 PM »
Simple answer is yes you get gains all over from using the ITBs. Though they are best used on cams that usually cause chop and stalling/surging with a plenum. The problem is you often can't get a decent MAP signal and you've ditched the MAF already so you end up mapping mostly on TPS/RPM. Very basic mapping but susceptible to atmos. changes without careful mapping and a decent computer. Luckily the LS1B PCM with EFI Live enables a TPS VE table that works with the usual IAT/ETC/BARO compensation tables.

My current cam is pretty tame really so it's more of an install and tuning exercise for me. I think I can just squeeze them under the bonnet but I will need to make some curved air horns over the valve covers. Backup plan is just to cut my spare bonnet and go with foam filters similar to the Driftworks car. Air boxes under the bonnet would be quieter for track days.

Offline Gunnytron

Re: UK RHD LS1 8.8 FD Gunnytron's build thread
« Reply #153 on: January 28, 2014, 02:31:17 AM »
Simple answer is yes you get gains all over from using the ITBs. Though they are best used on cams that usually cause chop and stalling/surging with a plenum. The problem is you often can't get a decent MAP signal and you've ditched the MAF already so you end up mapping mostly on TPS/RPM. Very basic mapping but susceptible to atmos. changes without careful mapping and a decent computer. Luckily the LS1B PCM with EFI Live enables a TPS VE table that works with the usual IAT/ETC/BARO compensation tables.

My current cam is pretty tame really so it's more of an install and tuning exercise for me. I think I can just squeeze them under the bonnet but I will need to make some curved air horns over the valve covers. Backup plan is just to cut my spare bonnet and go with foam filters similar to the Driftworks car. Air boxes under the bonnet would be quieter for track days.

You just reminded me I need to do some reading on tuning. I can barely understand what you talking about :)
http://www.norotors.com/index.php?topic=12880.0
FD, LS1 running 220 3.90 Trickflow heads, Comp Ultra-gold Arc 1.72 Rockers, 7.550 BTR Pushrods, BTR Stage II NA Cam 227/234 .614"/.576" 113+2, ARP Head Bolts, BTR Platinum Springs, Ported FAST 90, NW 90mm TB, FAST 60lb Injectors, Textralia Clutch/Flywheel, T56, Cobra 8.8, 31 spline, trac-loc 3.55 Diff, Holley HP EFI, Racelogic TC.

Offline bimbleuk

Re: UK RHD LS1 8.8 FD Gunnytron's build thread
« Reply #154 on: January 28, 2014, 06:34:27 AM »
Yeah it's taken me few months and a bit of trial and error to get savvy with all the terms and turn it into practise.

So usually the PCM uses the MAP/MAF sensors in combination to calculate the air entering the engine. Without those you can use throttle position against RPM which is great on track as you get the best throttle response. Not so good driving in traffic in the rain on a cold day. That's where the correction tables such as inlet temp (IAT), Coolant temp (ECT) and atmospheric pressure (BARO) come in handy.

Offline Gunnytron

Re: UK RHD LS1 8.8 FD Gunnytron's build thread
« Reply #155 on: January 28, 2014, 04:33:26 PM »
That all makes some sense, thanks.  8)
http://www.norotors.com/index.php?topic=12880.0
FD, LS1 running 220 3.90 Trickflow heads, Comp Ultra-gold Arc 1.72 Rockers, 7.550 BTR Pushrods, BTR Stage II NA Cam 227/234 .614"/.576" 113+2, ARP Head Bolts, BTR Platinum Springs, Ported FAST 90, NW 90mm TB, FAST 60lb Injectors, Textralia Clutch/Flywheel, T56, Cobra 8.8, 31 spline, trac-loc 3.55 Diff, Holley HP EFI, Racelogic TC.

Offline Gunnytron

Re: UK RHD LS1 8.8 FD Gunnytron's build thread
« Reply #156 on: February 01, 2014, 01:24:39 PM »
Got my bulkhead seam welded up today so next step is to get it to the paintshop.


I've also been spending lots of time tweaking the gauge install. My initial holes were too far off so i've had to pack out the rear with some plastic sheet. The bonus is that it's a nice flat surface for the screw clamps. It's still not perfect so needs a little tweeking.





I have also primed my intake ready for some wrinkle
« Last Edit: December 09, 2017, 08:21:27 AM by Gunnytron »
http://www.norotors.com/index.php?topic=12880.0
FD, LS1 running 220 3.90 Trickflow heads, Comp Ultra-gold Arc 1.72 Rockers, 7.550 BTR Pushrods, BTR Stage II NA Cam 227/234 .614"/.576" 113+2, ARP Head Bolts, BTR Platinum Springs, Ported FAST 90, NW 90mm TB, FAST 60lb Injectors, Textralia Clutch/Flywheel, T56, Cobra 8.8, 31 spline, trac-loc 3.55 Diff, Holley HP EFI, Racelogic TC.

Offline Gunnytron

Re: UK RHD LS1 8.8 FD Gunnytron's build thread
« Reply #157 on: February 02, 2014, 01:45:16 PM »
Got busy with the wrinkle paint today. I am pretty pleased with the valve covers. They aren't perfect though as I didn't lay the paint down thick enough on the sides by the edge lips. As it's not likely to be very visible I am not that bothered.

There is a blemish on the top near the oil filler hole. This was caused by an air pocket which I assume was in the filler. Again, not too obvious so I am not going to do anything to it.





I have thought about trying to cover them with a matt paint as I don't 100% like the way they look white when they catch the light. But that's just being fussy.

Unfortunately the intake didn't come out so well. I didn't lay paint down thick enough on the first layer so I have flat spot. Going to have to take this back down again and repaint.

« Last Edit: December 09, 2017, 08:24:23 AM by Gunnytron »
http://www.norotors.com/index.php?topic=12880.0
FD, LS1 running 220 3.90 Trickflow heads, Comp Ultra-gold Arc 1.72 Rockers, 7.550 BTR Pushrods, BTR Stage II NA Cam 227/234 .614"/.576" 113+2, ARP Head Bolts, BTR Platinum Springs, Ported FAST 90, NW 90mm TB, FAST 60lb Injectors, Textralia Clutch/Flywheel, T56, Cobra 8.8, 31 spline, trac-loc 3.55 Diff, Holley HP EFI, Racelogic TC.

Offline digitalsolo

Re: UK RHD LS1 8.8 FD Gunnytron's build thread
« Reply #158 on: February 02, 2014, 01:55:43 PM »
Valve covers look great, bummer the intake didn't come out quite right.
Blake MF'ing McBride
1988 Mazda RX7 - Turbo LS1/T56/ProEFI/8.8/Not Slow...   sold.
1965 Mustang Coupe - TT Coyote, TR6060, modern brakes/suspension...
2007 Aston Martin V8 Vantage - Gen V LT4/TR6060, upper/lower pullies, headers, tune.
2021 Tesla Model 3 Performance - Stock...ish.

Offline bimbleuk

Re: UK RHD LS1 8.8 FD Gunnytron's build thread
« Reply #159 on: February 03, 2014, 06:59:36 AM »
As above the valve covers look, pity they'll be mostly covered unlike the intake!

I had to cut a hole in the middle of my firewall, make a dent for the throttle position sensor and relocated the front brake line T at the weekend. There was me thinking I'd only have problems closing the bonnet on the new ITBs!

Offline Gunnytron

Re: UK RHD LS1 8.8 FD Gunnytron's build thread
« Reply #160 on: February 03, 2014, 08:48:43 AM »
As above the valve covers look, pity they'll be mostly covered unlike the intake!

I had to cut a hole in the middle of my firewall, make a dent for the throttle position sensor and relocated the front brake line T at the weekend. There was me thinking I'd only have problems closing the bonnet on the new ITBs!

Rule No1 when working on cars, it's never as easy as you think it's going to be :)
http://www.norotors.com/index.php?topic=12880.0
FD, LS1 running 220 3.90 Trickflow heads, Comp Ultra-gold Arc 1.72 Rockers, 7.550 BTR Pushrods, BTR Stage II NA Cam 227/234 .614"/.576" 113+2, ARP Head Bolts, BTR Platinum Springs, Ported FAST 90, NW 90mm TB, FAST 60lb Injectors, Textralia Clutch/Flywheel, T56, Cobra 8.8, 31 spline, trac-loc 3.55 Diff, Holley HP EFI, Racelogic TC.

Offline Gunnytron

Re: UK RHD LS1 8.8 FD Gunnytron's build thread
« Reply #161 on: February 08, 2014, 08:20:52 AM »
Not the most interesting purchase, but they were an eBay bargain. Not sure if i will need to change the boot angles. All I need now is the coil relocation brackets.
« Last Edit: December 09, 2017, 08:26:03 AM by Gunnytron »
http://www.norotors.com/index.php?topic=12880.0
FD, LS1 running 220 3.90 Trickflow heads, Comp Ultra-gold Arc 1.72 Rockers, 7.550 BTR Pushrods, BTR Stage II NA Cam 227/234 .614"/.576" 113+2, ARP Head Bolts, BTR Platinum Springs, Ported FAST 90, NW 90mm TB, FAST 60lb Injectors, Textralia Clutch/Flywheel, T56, Cobra 8.8, 31 spline, trac-loc 3.55 Diff, Holley HP EFI, Racelogic TC.

Offline airwolf16

Re: UK RHD LS1 8.8 FD Gunnytron's build thread
« Reply #162 on: February 08, 2014, 08:15:15 PM »
looking good. I like that Wrinkle paint!
did you preheat the parts before spraying?
i have thought about doing something like this in the future
“The good thing about science is that it's true whether or not you believe in it.” ― Neil deGrasse Tyson

Offline bimbleuk

Re: UK RHD LS1 8.8 FD Gunnytron's build thread
« Reply #163 on: February 09, 2014, 01:48:53 AM »
Not the most interesting purchase, but they were an eBay bargain. Not sure if I will need to change the boot angles. All I need now is the coil relocation brackets.

Make the brackets! I've seen the ones on Ebay.com and they're just a bent bit of ally with some spacers. Can't be beyond your fabbing skills.

I've decided to mount mine behind each front wing and just ordered two 36" loom extensions from Ebay.com as the exchange rate is favourable. As usual my sis is getting the job of shipping them over to me.

Offline Gunnytron

Re: UK RHD LS1 8.8 FD Gunnytron's build thread
« Reply #164 on: February 09, 2014, 05:27:50 AM »
looking good. I like that Wrinkle paint!
did you preheat the parts before spraying?
i have thought about doing something like this in the future

I stuck the parts and the cans on the house radiators to heat them up. I then had a small heater running in the spray tent. I did it on a cold day though so the Ali didn't stay warm that long. The covers just fitted in the oven. The intake was heated with a heat gun.
http://www.norotors.com/index.php?topic=12880.0
FD, LS1 running 220 3.90 Trickflow heads, Comp Ultra-gold Arc 1.72 Rockers, 7.550 BTR Pushrods, BTR Stage II NA Cam 227/234 .614"/.576" 113+2, ARP Head Bolts, BTR Platinum Springs, Ported FAST 90, NW 90mm TB, FAST 60lb Injectors, Textralia Clutch/Flywheel, T56, Cobra 8.8, 31 spline, trac-loc 3.55 Diff, Holley HP EFI, Racelogic TC.