Supercharger - Page 7 - 3000GT/Stealth International Message Center

Beau_Jester · 08-11-2008, 04:07 PM

SC vs Turbo ?

I seem to loose my get up and go when I shift into 3rd gear. The shift from second to third with a 6000 rpm shift point dropped my rpm below 4000. It is like forever to get momentum going and then oh oh here comes the turbo car passing me. My trap speed was only 95mph, though.

Stealthee · 08-11-2008, 04:30 PM

Why would you shift at 6000RPM with a 7000 redline and 7300 rev limit?

Kibwe Walker · 08-11-2008, 04:33 PM

Quote:

Originally Posted by Beau_Jester

SC vs Turbo ?

I seem to loose my get up and go when I shift into 3rd gear. The shift from second to third with a 6000 rpm shift point dropped my rpm below 4000. It is like forever to get momentum going and then oh oh here comes the turbo car passing me. My trap speed was only 95mph, though.

Do you have any intercooling or I guess aftercooler for a supercharger?

Not to mention the parasitic loss of the supercharger to begin with.

Anyways even with 9b's I notice a decent pick up in the 90-100+ area once I upgraded to DSM SMIC's? The stock IC's would get heat soaked pretty good with just one good pull through 3 gears pretty much killing the topend ability.

DSM SMIC's are about twice the size and don't get hot and the pull stays pretty much the same. Just a thought as to the difference in pull up top.

Beau_Jester · 08-12-2008, 11:38 AM

I shift at 6000 rpm because the dyno indicated I had no gain in power after that point. This was the shift point the tuner selected.

No intercooler....yet. I have some stock VR4 side mounts that I may install but I am not sure how much they will help since I will be cooling the charge before the air reaches the supercharger. The water/alcohol injection will probably be more effective.

Kibwe Walker · 08-12-2008, 02:34 PM

two things

1 just because you are not gaining any more power beyond 6k rpms doesn't make that your shift point. The goal is to have the most AVERAGE hp for your run down the track or whatever meaning you want to take your shift point a little PAST peak hp so that when you shift and the rpms fall they do not fall to far down the powerband to DECREASE your average hp for the run. Don't be surprised if your car runs a little bit better taking it to 6500 through 2nd gear and 63xx for 3rd.

2nd you are right about the alchy injection but with a supercharger if you have it set to come in you will be using alot of alcohol since you will build boost so easy.

Stealthee · 08-12-2008, 03:59 PM

Kibwe nailed it. Just because you dont gain power doesnt mean you shift there. You want to shift whereas your RPMS fall right back into the powerband. Shifting at 6000 rpm you are severely hurting your times.

08-11-2008, 04:07 PM	#61 (permalink)
Beau_Jester Ahhh. La Fee Verte. Join Date: Jul 2005 Location: NW Indiana Drives: 94 3kGT base Trader Rating: (9)	Re: Supercharger SC vs Turbo ? I seem to loose my get up and go when I shift into 3rd gear. The shift from second to third with a 6000 rpm shift point dropped my rpm below 4000. It is like forever to get momentum going and then oh oh here comes the turbo car passing me. My trap speed was only 95mph, though. __________________ Red 94 Base 3000GT: TK Eaton supercharger @ 8psi, 360cc injectors, SAFC II, 3SX downpipe, Magnaflow w/2.5" pipes, Dyno tuned @ 223 WHP, Quaife LSD, double synchro 3/4 gears, 10% over 5th gear. 93 Black RT/TT Stealth: Newest project. Engine to be rebuilt, 15g turbos, RC 550cc, MAFT Gen-II, GM 3.5" MAF, Dejon blow-thru intake.

08-11-2008, 04:30 PM	#62 (permalink)
Stealthee Damage Control Join Date: Jul 2003 Location: 1 hr south of Pitt Drives: 1994 Stealth Trader Rating: (78)	Re: Supercharger Why would you shift at 6000RPM with a 7000 redline and 7300 rev limit? __________________ Kbizzle [11:25 P.M.]: my ass is really sore Kbizzle [11:25 P.M.]: this is most displeasing

08-12-2008, 11:38 AM	#64 (permalink)
Beau_Jester Ahhh. La Fee Verte. Join Date: Jul 2005 Location: NW Indiana Drives: 94 3kGT base Trader Rating: (9)	Re: Supercharger I shift at 6000 rpm because the dyno indicated I had no gain in power after that point. This was the shift point the tuner selected. No intercooler....yet. I have some stock VR4 side mounts that I may install but I am not sure how much they will help since I will be cooling the charge before the air reaches the supercharger. The water/alcohol injection will probably be more effective.

08-12-2008, 02:34 PM	#65 (permalink)
Kibwe Walker Forum Member Join Date: Aug 2003 Location: Nashville Drives: 93 RT/tt Trader Rating: (2)	Re: Supercharger two things 1 just because you are not gaining any more power beyond 6k rpms doesn't make that your shift point. The goal is to have the most AVERAGE hp for your run down the track or whatever meaning you want to take your shift point a little PAST peak hp so that when you shift and the rpms fall they do not fall to far down the powerband to DECREASE your average hp for the run. Don't be surprised if your car runs a little bit better taking it to 6500 through 2nd gear and 63xx for 3rd. 2nd you are right about the alchy injection but with a supercharger if you have it set to come in you will be using alot of alcohol since you will build boost so easy.

08-12-2008, 03:59 PM	#66 (permalink)
Stealthee Damage Control Join Date: Jul 2003 Location: 1 hr south of Pitt Drives: 1994 Stealth Trader Rating: (78)	Re: Supercharger Kibwe nailed it. Just because you dont gain power doesnt mean you shift there. You want to shift whereas your RPMS fall right back into the powerband. Shifting at 6000 rpm you are severely hurting your times.

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