Dyno Tuning 370/S480/E85 Blowthrough help needed. - LS1TECH



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Dyno Tuning 370/S480/E85 Blowthrough help needed.

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Old 10-23-2016, 02:34 PM   #1
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Arrow Dyno Tuning 370/S480/E85 Blowthrough help needed.

Hey guys, I've finally been able to work out the bugs in my setup to be able to hit the dyno. I have a pretty good idea of how to tune the car streetwise but I've never tuned my own vehicle on a dyno; So I'm looking for any tuning advice people are willing to give. I have found someone locally who is willing to rent out their dyno to me which is great.

My setup is a 96 SN95 Mustang with a fully forged 10:1 370, 317s w/ PAC .650s, Morel lifters, 3/8 .120 wall PAC pushrods, LS9 gaskets, LJMS Custom cam (similar stage 3) Super Vic intake, CSU Dual Needle and Seat Blowthrough Carb on E85 with a Borg S480 cast wheel .96/1.32. The carb was custom built to combo by Kevin and runs excellent. Aside from some jet changes, I haven't had to mess with the carb at all. The car has a JW Brake RMVB Th400 with a custom built Billet Revmax convertor. The turbo kit was custom built by me and is a flipped shorty to divided 2.25 to T6 flange setup, Dual 44mm gates and Dual 50mm Bovs with a 4" this Air to Air intercooler. Right now the gate springs are around 12-15lbs of boost. I have a GFB electronic boost controller with a mac 4 port but I'm just looking to tune it on gate pressure. (car is ridiculous on low boost already.)

Right now the car idles excellent at 12.7-13.0 AFR and runs smooth down the road. The car lights off so fast that trying to WOT tune it on the street is near impossible to pay attention to the AEM UEGO wideband. So that's why I'm hitting the Dyno. I'm running a MSD 6010 with a 3bar map sensor. The car has 32* at idle until atmosphere then pulls down to 18* at 5lbs and then flat lines 15* from their on out. I have BR7EF plugs in it and the E85 is spot on at 85% tested.

My plan is to strap it down on the dyno with fresh plugs, pull the timing down to 11* WOT and make a hit. Checking the AFR, and reading plugs, ill add a degree or 2 until around 15* which is where Kevin reccomened or keeping the heat on the corner bend of the ground strap. From there if the tune is too fat on the fuel side I can go down 2 jet sizes in the secondary's until I net a final AFR of 11.4ish. Though the motor is forged I want to treat it like a SBE motor to keep it alive. I have invested a lot of time and money into it and cannot Afford to blow it up lol.

ANY advice is appreciated. Ive posted this in the carb forum and the tuning forum as well bc I know there is very knowledgeable people in each forum. here are two viedos showing the car idling and a second gear hit when it had 4.10s but now it has 3.31s.



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Old 10-24-2016, 06:26 AM   #2
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This car is gonna be wicked! Makes me want to do a blowthru setup so bad
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Old 10-24-2016, 10:21 AM   #3
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Thanks man. It should make some steam for sure. I like the blowthrough a lot but the only downfall is datalogging capabilities.
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Old 10-25-2016, 05:50 PM   #4
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When I ran a blowthru and Procharger, it was happy at 22 degs total @ 12 lbs of boost-they are all diff though, just where my was at on the dyno
Kevin def builds a good carb, all he did for me ran out of the box, just a small tweak to my liking
I used an old LM 1 for my dataloging, using an RPM converter, worked pretty good
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Old 12-05-2016, 08:30 AM   #5
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I have run several blow thru setups and worked fine, been using Patrick @ ProSystems carbs for a long time as well, when started my turbo LS E85 project contacted Patrick, told me he would not do a carb for me as would never get the cylinder balance correct and needed EFI on this. went the EFI route with mega squirt and has been awesome, so just info here...
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Old 12-11-2016, 01:11 PM   #6
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Thanks EZ, as much as I love the simplicity of the carb I'm looking at going to FI just for all the datalogging capabilities. Going to use either GoldBox or MS3pro.
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Old 02-13-2017, 09:38 AM   #7
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How does it do with that radiator? I have a nearly identical setup but I've been nervous to go street cruising with it.
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Old 02-18-2017, 07:26 PM   #8
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I have zero issues with it man. runs 180 all day long in the fl heat. make sure you have a good fan and a completely sealed shroud.
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Old 02-20-2017, 10:02 AM   #9
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Good to hear! Hopefully will be putting tags on it this spring. Btw good color choice!

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Old 03-14-2017, 11:55 AM   #10
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haha man talk about twinning! lol car looks great!
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Old 03-14-2017, 01:50 PM   #11
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Serioussn95 have you taken your car back to the track after all the updates?
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Old 03-15-2017, 06:35 AM   #12
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Baron: yes I have recently but I haven't had time to update on here.. I added the VS racing Billet 88 and I Love it. Its a killer turbo and for the money you cannot beat it. Last time car went out it went very low 6's in the 1/8. We strapped it to the dyno and it made 500 on 5lbs but was blowing through the convertor very bad. We hit it with more boost and it made less power bc the convertor was in the 35% slip range. I ordered a custom PTC unit from Dusty Bradford that's being built as we speak. Ill add some videos soon!
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Old 03-15-2017, 04:02 PM   #13
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What size converter did you end up going with?
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Old 03-17-2017, 01:28 PM   #14
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I hooked up with Dusty from PTC and bought the spec'd 9.5 unit for my combo. Cant wait to see what it does!
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Old 03-18-2017, 06:57 AM   #15
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Heres the dyno vid of the car making 500 on 5lbs blowing through the convertor. Cant wait to get the new PTC from Dusty in the car and going!



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