WS6HUMMER

iTrader: (19)

OK its not huge but pretty big compared to what I'm used to. Here's the run down: Its a friends car that we are bringing to the Redemption II race @ SGMP. Its a non LS powered car, SBF based motor, glide, & a single GT5588. My friend tried to test out how fast it would spool on the brake & 2 step (brend new setup) and lets just say if we cant make it spool faster we will be changing the trans fluid every pass. Please pardon the non LS part of this post.

nodrok

WE need more info on the set up. As much as you can give

mcm375

Is this a twin-scroll (divided turbine housing) turbo?

A quickspool like device might be useful if so.

https://ls1tech.com/forums/forced-in...ke-graphs.html

projectcam

iTrader: (12)

Converter??

texas94z

Nitrous.

TurboAv

iTrader: (6)

Is the tune optimized for spooling on the brake?

This second.

This if the other two don't help.

WhistlingZ

Primary sizes? Crossover size?

Nitroused383

iTrader: (10)

Most important is what size engine is this SBF? Could be a 302 or a 440 for all we know. Also, a GT55 turbine wheel is 111mm, it will not spool well on a small engine.

Fireball

iTrader: (21)

It's easier after a burnout...once heat gets in the turbine

CarsandWomen

iTrader: (19)

how are you holding the WG closed? ie manifold pressure reference, spring pressure, or co2? this is assuming there are no leaks anywhere, you did say this is a new setup.

turbo'd stang

Give some more info. CI, a/r and which wheel. I have a 331ci sbf with a 98. I've been down your road.

WS6HUMMER

iTrader: (19)

347 stroked, dart block, AFR 195's,AMS 1000,still EFI (160# injectors). We had a super 76 on it before and it was done @ 28# of boost leaving us needing more. Tried a GT4780, it spooled ok but just not the edge he wanted. This is a true 10.5 drag radial car. Oh yeah it has a 1.23 AR on the hot side.
Not a divided housing

Custom converter built by Lenny @ Ultimate Converter.

No nitrous, cant have 2 power adders in the class we're running.

This is kinda what advice I'm looking for.

2.5" crossover, 3.5" charge pipe, & A2A Custom made intercooler.

Fireball

iTrader: (21)

Cam installed centerline?

WS6HUMMER

iTrader: (19)

347, & yeah we are finding out

Good info, never thought about that but it does make a lot of sense.

AMS1000 & CO2. We are in the process of making up a cap to boost leak test.

347ci, the inducer is a billet wheel custom made by Exile turbo, the turbine wheel I'm not sure on the size but someone in this thread posted earlier that the GT55's have a 111mm wheel.

WS6HUMMER

iTrader: (19)

My friend says he's not certain but he thinks its installed +2. Can you recommend an optimal AFR to spool it up while on the brake?

Phil99vette

iTrader: (11)

There are soo many ways to aid in turbo spool. Basically you need to make more motor torque. Just a few things I can disclose...

More timing
Advance the cam
wrap the pipes
Turbo blanket
depends on combo but most N/A motors make the best torque 12.6-12.9:1.

WS6HUMMER

iTrader: (19)

Thanks for the help, I will let him know, we're supposed to be boost leak testing first and then we will start with the tune.

Nitroused383

iTrader: (10)

Try anywhere from 35-48 degrees of timing while on the brake with a leaner afr 12-14:1. If that doesn't help the 111mm wheel may be a bit much for a 347, see if you could run the 98mm turbine wheel from the GT-50 hotside. Also what are the specs on the cam? The guys that are able to spool decent sized turbos appear to be making more engine torque in the stall rpm area. They usually run a reverse split cam with 4-6 degrees less exhaust duration than intake duration. Lobe seperation angles around 115-116 degrees is not uncommon while having a 110-111 intake centerline.

Could always try advancing the cam some too as that will create more torque at a lower engine rpm.

turbo'd stang

When you are footbraking, how many RPM's is it able to reach? I played around alot with mine. It seemed to like high 30's timing and AFR around 11.8-12. He's going to have to play with it and see what it wants

Any info on the stator in the converter? He may need to have a tad looser one put in if the motor is only reving to 2-2500. These little motors have to hit around 2700-3000 to get anything going. Mine would hit a wall at 2200 and take around 20 seconds to get spooling. Yeah, it cooked the fluid. After a converter change, it comes up to 25-2700 and then just takes off.