SPINFAST install with pics
Thread Starter
Tech Contributor
Joined: Jul 2002
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From: St. Louis, MO
St. Jude Donor '08
Take a look at your Power Enrichment to clear up the spark knock at the 4000 up rpm range, the fast will make it go lean since that's the area where the intake really starts to give a lot more air flow over the stock unit. If you had a wide-band hooked up, I'd bet your'e going as lean as 14.0-16.0 under wide open throttle causing it to go lean and henceforth KNOCK!
Big cams and big free flowing intake tracts love fuel... Mine likes it around 12.9 under WOT
Big cams and big free flowing intake tracts love fuel... Mine likes it around 12.9 under WOTQuestion for you (and others)...I noticed that my Dynamic ClyAir (load on the engine) was .82 at tq peak of 5k, trending down to .76 on the top end at 6.7k. MAP was consistent at 100. My initial though was perhaps my vararam or MAF screen were causing a restriction at my new power level (or my air filter might be dirty), though the MAP remaining consistent countered that theory. Dyno operator thought this is due to the fact it was an inertia dyno and the load on the engine gets less as rpm's go up.
Any thoughts?
Last edited by Joe_G; Nov 11, 2008 at 06:25 AM.
Burning Brakes
Joined: Oct 2005
Posts: 791
Likes: 2
From: Stafford Virginia
Isaiah I've got a WB and it was running around 13.3 with my pre-fast fueling, but your estimation once again is on point - my best results were 12.9 -12.7 on the dyno. When I hit the track that may lean out some so I'll keep my eye on my WB scans. I also programmed the Warmup Transient Fuel change you recommended, we'll see how that combined with the increased timing down low < 3k does around town with increasing the engine response for heel and toe shifting.
Question for you (and others)...I noticed that my Dynamic ClyAir (load on the engine) was .82 at tq peak of 5k, trending down to .76 on the top end at 6.7k. MAP was consistent at 100. My initial though was perhaps my vararam or MAF screen were causing a restriction at my new power level (or my air filter might be dirty), though the MAP remaining consistent countered that theory. Dyno operator thought this is due to the fact it was an inertia dyno and the load on the engine gets less as rpm's go up.
Any thoughts?
Question for you (and others)...I noticed that my Dynamic ClyAir (load on the engine) was .82 at tq peak of 5k, trending down to .76 on the top end at 6.7k. MAP was consistent at 100. My initial though was perhaps my vararam or MAF screen were causing a restriction at my new power level (or my air filter might be dirty), though the MAP remaining consistent countered that theory. Dyno operator thought this is due to the fact it was an inertia dyno and the load on the engine gets less as rpm's go up.
Any thoughts?
As far as the Warmup Transient fuel change goes; if you go too far your rpm's wont drop as quick in between shifts, so it's a fine line. 10 was stock and 15 was too far. As far as the Dynamic Cyl Air goes, I haven't setup a pid for that yet so I'm not exactly sure what to think although what dyno operator says would definitly makes sense. It would have to factor into the total load.I'm not sure if you remember talking with me over the phone last year but the advise you gave me as far as launching goes has been a great help, I'm consistently pulling high 1.6's to low 1.7's. Not sure how many more runs my clutch and dr's have in them though. Now I just need to get me a FAST so I can go really fassstttt.
Safety Car
Joined: May 2005
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From: Corpus Christi Texas
Nice gains. Our graphs from 3500 on up are very similar, almost identical at points. Below 3500, due to that bump in compression ratio, you've got 20-30ft-lbs on me. Of course those 3.90 gears probably lower the numbers just bit?
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Tech Contributor
Joined: Jul 2002
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From: St. Louis, MO
St. Jude Donor '08
The compression bump is a good mod and not so expensive.
If you've got your .drf files from your dyno I'll overlay our graphs so we can see how they look so we can see what the compression would do.
Last edited by Joe_G; Nov 13, 2008 at 04:24 AM.
Thread Starter
Tech Contributor
Joined: Jul 2002
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From: St. Louis, MO
St. Jude Donor '08
Well your A/F wasn't out as far as I thought it might be, but enough to make some possible spark knock, I'm not sure why you had to take out so much timing even after you got the A/f right though, 1-2 maybe, but 3-4 might be overkill or just very safety consious...
As far as the Warmup Transient fuel change goes; if you go too far your rpm's wont drop as quick in between shifts, so it's a fine line. 10 was stock and 15 was too far. As far as the Dynamic Cyl Air goes, I haven't setup a pid for that yet so I'm not exactly sure what to think although what dyno operator says would definitly makes sense. It would have to factor into the total load.I'm not sure if you remember talking with me over the phone last year but the advise you gave me as far as launching goes has been a great help, I'm consistently pulling high 1.6's to low 1.7's. Not sure how many more runs my clutch and dr's have in them though. Now I just need to get me a FAST so I can go really fassstttt.
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Thread Starter
Tech Contributor
Joined: Jul 2002
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From: St. Louis, MO
St. Jude Donor '08
But the FAST was the next step in my progression. Heads & clutch will be next.
Safety Car
Joined: Sep 2006
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From: Cheektowaga NY
St. Jude Donor '08
So the ported Fast90 gave you 14rwhp over the ported Stock intake?
What would be the total gained with the Fast90 over the stock unit?
Burning Brakes
Joined: Jan 2008
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From: BURTON MI
Thread Starter
Tech Contributor
Joined: Jul 2002
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From: St. Louis, MO
St. Jude Donor '08
I got about 10/10 from the ported stocker...and 14/15 from the Spinfast.
So 24/25 from stock to ported Spinfast.
I'm eager to get some 1/4 mile times, our first Corvette Challenge on the new track is next week. The weather is still hot though...I'm on my back porch sweating at 86 degrees as I type this!
So 24/25 from stock to ported Spinfast.
I'm eager to get some 1/4 mile times, our first Corvette Challenge on the new track is next week. The weather is still hot though...I'm on my back porch sweating at 86 degrees as I type this!
Racer
Joined: Jun 2005
Posts: 398
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From: Kokomo Indiana
I figured I would chime in here and see what others thought. My setup and Joe's are almost identical. The only differences are intake (90/92), gears (3.42/3.90), and compression (MLS/.040). Below is a graph of my car vs. Joe's. (435/443). Obviously there are variables in dyno's, but we are looking at around a 8hp difference between the two cars. SPIN says remove ~10 for the gears and add ~7 for a (-3hp) calculation on this. This brings our difference to 5hp. Only reason I bring this up is I feel it is a good calculation to use and have the graphs to show.
Also, my MPH in the 1/8th is ~95mph.
Joe - Where is your cutout located?
Also, my MPH in the 1/8th is ~95mph.
Joe - Where is your cutout located?
Last edited by Black02SS; Nov 15, 2008 at 01:01 PM.
Racer
Joined: Jun 2005
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From: Kokomo Indiana
Thread Starter
Tech Contributor
Joined: Jul 2002
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From: St. Louis, MO
St. Jude Donor '08
I went to my 1/8 mile track the other day with street tires...ran a 2.3 and 7.9 and got my a$$ handed to me by some dude in a SRT8 Dodge 4x4 SUV who ran a 1.6 and 7.4. (thought I heard later he was running a sneaky pete nitrous system).... I can't stand running street tires!
Melting Slicks
Joined: Mar 2008
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From: Avon Park FLORIDA
St. Jude Donor '08-'09-'10
Thread Starter
Tech Contributor
Joined: Jul 2002
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From: St. Louis, MO
St. Jude Donor '08
Thanks! Rob at Florida Performance at Dixie and Commercial down here. Here's more details including install tips.
http://forums.corvetteforum.com/c6-t...-on-my-c6.html
http://forums.corvetteforum.com/c6-t...-on-my-c6.html
Thread Starter
Tech Contributor
Joined: Jul 2002
Posts: 14,949
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From: St. Louis, MO
St. Jude Donor '08
Props for SPINMONSTER
While I didn't gain as big of "under the curve" as some people did, the REAL dyno, the dragstrip, shows what my SOTP meter is feeling. My car is a LOT faster.
I am now trapping 124 consistently in the 1/4 and 95+ in the 1/8. I used to trap 120 consistently and 93 so it's a solid 4mph and 2mph respectively. My buddy who I used run neck and neck with I now can whoop in a 4th gear roll on the track.
Here's a thread on my recent track results.
http://forums.corvetteforum.com/c6-t...with-pics.html
And video
I am now trapping 124 consistently in the 1/4 and 95+ in the 1/8. I used to trap 120 consistently and 93 so it's a solid 4mph and 2mph respectively. My buddy who I used run neck and neck with I now can whoop in a 4th gear roll on the track.
Here's a thread on my recent track results.
http://forums.corvetteforum.com/c6-t...with-pics.html
And video