spool time on 4.8 auto
spool time on 4.8 auto Hey guys im considering going to a on3 76mm non bb. Right now I have a hx55 which is a bit laggy with its 9xmm exhaust wheel. Its a stock 4.8 with 317 heads and a 4l80 with a stock converter. Any idea on what type of spool time it would have with the 76mm???
Stock cam? The real problem is the super low compression. A smaller exhaust wheel which will help some.
HX55 specs:
Compressor inducer - 65mm
Compressor exducer - 98mm
Turbine inducer is - 86mm
Turbine exducer is - 72mm
HX55 specs:
Compressor inducer - 65mm
Compressor exducer - 98mm
Turbine inducer is - 86mm
Turbine exducer is - 72mm
It does have a ls6 cam and some light porting on the exhaust ports. Otherwise stock.thats why I was thinking the .81 a/r housing because I think that was the smallest they offered.
Don't those HX55's have a large exh AR? With a 4.8 and low comp, a 2" hotside, a little more stall and a .81-.96 would spool much quicker. Matt aka Denmah has done great with his 4.8 and on3 76. Read through Fairmont 3.0
The compression is fine. Yes its low but it is also a street car. I will make up the power with a little ectra boost. I just need to try to get it in quicker thats why I would swap turbo.
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo
317s on a 4.8 is not "super low" compression. Compression isn't the problem IMO. A full point of compression is worth about 4% of your total power NA. Thats around 10HP on a 4.8. Not a game changer! Though the extra boost you can run coupled with a better flowing 317 head will more than make up for the compression drop.
HX55 can come with 20+cm housings. Thats like a 1.6x AR.
Need to give us more information than "a bit laggy". When do you start seeing boost? Full boost? How much boost do you run? How large is your hotside? current AR housing? Fuel used? Have you checked for boost/exhaust leaks?
I wouldn't run a .81AR housing.
HX55 can come with 20+cm housings. Thats like a 1.6x AR.
Need to give us more information than "a bit laggy". When do you start seeing boost? Full boost? How much boost do you run? How large is your hotside? current AR housing? Fuel used? Have you checked for boost/exhaust leaks?
I wouldn't run a .81AR housing.
Last edited by Forcefed86; Mar 7, 2014 at 01:55 PM.
I was just looking for a general answer for a stock motor and auto. But im on 93 gas. Front mount setup with air to air. Motor is 01 4.8 with ls6 cam and some springs. 317 with light exhaust work. Stock intake............ caris about 3200lb. 3.27 rear gear. Turbo does not say on it what size exhaust housing but look wise looks in the 1.5 range. It is about the same size as a ebay gt45.
I was just looking for a general answer for a stock motor and auto. But im on 93 gas. Front mount setup with air to air. Motor is 01 4.8 with ls6 cam and some springs. 317 with light exhaust work. Stock intake............ caris about 3200lb. 3.27 rear gear. Turbo does not say on it what size exhaust housing but look wise looks in the 1.5 range. It is about the same size as a ebay gt45.
(edited after you posted again)
Is 12lbs all you run? Where do you redline. When do you start making boost?
It is actually simple I was wanting to know as a stock 4.8 and stock converter even 4l60 what spool times people are seeing with the on3 76mm. Im not asking on my specific setup. That should be simple enough
I messaged on3 and they claim with a76mm in a stock 4.8 truck it starts boost in the 2k range and full boost inthe 3k range. So I figure ill give it a try. The holset is nice but would be alot better if 6.0 or big stall.
