Serioussn95

iTrader: (1)

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.

Nitroused383

iTrader: (10)

I would add a degree of timing until it stops making big hp gains. 1 degree should gain around 20-30 hp at a time and when it starts to only gain 10-15 hp you know you are kind of past the sweet spot. Being on e85 it's mostly likely going to be want more than 15 degrees of timing. In my experience the S4xx 317 370 combos I've tuned like around 18-22 degrees of timing. Being a carb setup it may like even more than that as you have the fuel being mixed with the air further away from the intake valves which will allow more time for the e85 to cool the mixture. Don't get stuck on any specific number and just see what your combo likes.

Serioussn95

iTrader: (1)

Thanks for the info. I have been reading a lot about Peak Torque and then adjusting the timing from there. I figured 15 would be very safe at the lower boost levels so I'll just have to see what the motor likes on the dyno. Also, love your build and videos man. I'm subscribed on youtube the car runs awesome!

JoeNova

You should probably be able to squeeze 17-19 PSI out of that setup depending on boost levels and not have any issues. You're not going to hurt a forged motor from power alone. It should be able to take everything that S480 has.

12.7:1 - 13:1 is actually a very rich idle. I usually lean out between 15:1 and 16:1.

JoeNova

Crap, I meant 17-19 degrees, not PSI.

Serioussn95

iTrader: (1)

I got ya lol. Thanks man, ive had it leaner at idle but it seems to run a lot better at mid 13's area especially coming off idle and driving.