Want advice on spooling a larger turbo.
#1
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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.
#3
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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
A quickspool like device might be useful if so.
https://ls1tech.com/forums/forced-in...ke-graphs.html
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#12
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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.
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
A quickspool like device might be useful if so.
https://ls1tech.com/forums/forced-in...ke-graphs.html
Custom converter built by Lenny @ Ultimate Converter.
No nitrous, cant have 2 power adders in the class we're running.
2.5" crossover, 3.5" charge pipe, & A2A Custom made intercooler.
#14
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Good info, never thought about that but it does make a lot of sense.
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.
#18
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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.
Could always try advancing the cam some too as that will create more torque at a lower engine rpm.
Last edited by Nitroused383; 02-17-2011 at 04:22 PM.
#19
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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.
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.
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