12-02-2019, 11:49 AM | #1 |
Drives: Blown C7 and 6th gen Join Date: Aug 2012
Location: NorCal
Posts: 410
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Going from a 92mm to 90mm will I need to retune
I am hoping not. I do have a WB I can monitor and HP Tuners for both cars so I can certainly make some small tweaks if needed. I was hoping however I could just swap pulleys and be good to go. I guess I should just log and see what happens.
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12-02-2019, 01:14 PM | #2 |
Drives: 2022 Lt1 A10 Join Date: Nov 2015
Location: clark, mo
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Teddy you meant 95 correct? It will probably need just a little tweaking.
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12-02-2019, 02:23 PM | #3 |
Drives: Blown C7 and 6th gen Join Date: Aug 2012
Location: NorCal
Posts: 410
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You are correct. I believe the car currently has a 95mm pulley on it, I just got my 90mm in the mail. I am guessing that is a bigger discrepancy and a retune is likely. Damn it.
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14 Corvette Z51 Coupe - 655RWHP
A&A Ti Blower, Alky Control Meth kit, Kooks LT setup, Corsa Catback, Full APR CF kit, RK Sports CF hood, hell CF everything LOL 17 Camaro 2SS 50th edition. TOTALED 6/2019 K&N Intake, MRBP axleback, Eibach kit, 20" Z28 wheels, smoked lights all the way around, Rockford Fosgate system 17 Camaro 2SS 50th edition. Round 2- 8/2019 550/600 RWHP, Magnuson TVS2300, Rotofab Intake, Corsa Xtreme, Air Lift P3 System, 20" Stance SF-07, smoked lights all the way around, Rockford Fosgate system. |
12-02-2019, 02:53 PM | #4 |
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if its by default and from the stock, you probably have the 98mm pulley. I went from 98 to 95, had to re-tune (just because I'm anal). but if your going by that much, then I'd say for sure, get it re-tuned. are you still on the canned tune?
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12-02-2019, 02:58 PM | #5 |
Drives: 2022 Lt1 A10 Join Date: Nov 2015
Location: clark, mo
Posts: 8,860
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Teddy skipped the 98mm and went to the 95mm and that's how it was tuned. It probably won't need a lot of change but you should call your tuner and see if he could do that for free since you just spent a shit load on the last tuning on the dyno.
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12-02-2019, 03:53 PM | #6 |
HYPER SS
Drives: 2016 Supercharged 2SS Join Date: Feb 2014
Location: Troy OH
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agreed. if he already paid for the credits etc. it may not cost him that much then. when I had mine re-tuned (HP tuners) he only charged me 160 to re-strap it down and do 4 pulls/retune ect. hopefully his tuner is cool like that. either way, I'd re-tune it. he has alot of money involved anyway
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12-02-2019, 04:19 PM | #7 |
Drives: Hyper Blue 2016 2SS 6M Join Date: Sep 2017
Location: North Ga
Posts: 1,787
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Don't forget the belt. No way you will be able to use the same one when dropping 5mm
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12-02-2019, 05:37 PM | #8 |
Drives: 2016 1SS NFG A8 Join Date: Aug 2017
Location: 46804
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If you add more air then you have to add more fuel to make more power and keep the AFR in a safe range...so yes the fueling will need touched up.
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12-02-2019, 09:55 PM | #9 | |
2016 loaded 2SS
Drives: Maverick X3 Turbo R Join Date: Feb 2015
Location: United States
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Quote:
get a datalog and send it to your tuner. Whenever you make a change to the amount of air going to your motor you should have your tune checked out.
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12-03-2019, 10:07 AM | #10 |
Drives: Blown C7 and 6th gen Join Date: Aug 2012
Location: NorCal
Posts: 410
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I appreciate everyone's feedback here. Not sure what the tuner will want to do. He is about 2 hours away so just going down is not so easy. I might just hold on to the pulley until I am ready for drop in pistons or something. Being naive here I figured I could pulley down a bit and be fine would just need to watch up top. I honestly thought I was at 92mm so 90mm wasnt such a drastic change. Now it looks like I will need a new belt and tune. I should be happy with enough for now. I have not even put 250 miles on this car yet. LOL
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12-03-2019, 06:59 PM | #11 |
Drives: Blown C7 and 6th gen Join Date: Aug 2012
Location: NorCal
Posts: 410
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12-03-2019, 07:42 PM | #12 |
Drives: 2022 Lt1 A10 Join Date: Nov 2015
Location: clark, mo
Posts: 8,860
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If your only dropping less then a 1/4" it should work.
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2022 Lt1 6.2 A10, Maggie 2300, THPSI Port Inj/10 rib, Rotofab, E, Nickey, SCOL, Griptech, RC Bandits, Hoosiers/MT 9.80@142.96 1.44 60ft, 6.34@112 707/669 RWHP/TRQ. 16SS Maggie 2650 9.41@147 1.35 60ft, 5.99@119. 16 C7 A8 10.90@128 Bolt on stuff
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12-03-2019, 08:03 PM | #13 |
Drives: Blown C7 and 6th gen Join Date: Aug 2012
Location: NorCal
Posts: 410
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