Thanks to SPINMONSTER for getting my FAST modded & ported. SPIN's experience on modding for the C6 was excellent - there's not much room for the brake booster port or the MAP hole and he placed mine perfectly, the FAST slipped right in.

This hump in the back is why a FAST doesn't fit in a C6:



Here's where SPIN mods the intake to fit the c6. I had to enlarge the MAP hole with a 7/16 drill and the entire FAST slipped right in. I bought LS1 injector o-rings and some washers from local Advanced Auto and I was in business.

Rear Mods:


MAF hole


Porting



SPIN offers this service for a bargain price of $299. It's not worth fooling around and potentially messing it up for $299 - let the expert do it! He knows exactly where to make the holes and the mods and how to port it. I will be making a donation to St. Judes also, and I recommend all who read this make the Pay Pal donation. It's quick and easy to do.

I will have a dyno day and some good 1/4 miles soon.

In the meantime, I noticed my ltft's and afr error were adding about 3% fuel after the FAST. As a quick and dirty I scaled my VE table by 1.05 and my ltft's and AFR's are adding about 1% now. My WOT fueling went from 12.6 to 13.3. My idle raised about 50 from commanded...but it's learning and getting close back to 750. Car starts and runs great like always.

I was able to get to the 1/8 mile track late last night, I'm going to need to relearn the car, and I need new tires, my drag radials are getting long in the tooth. I bogged a 2.7k launch to a 1.9 7.8 @ 95.7, then had two 5k spinning 1.9 launches to 7.7 @ 95.7 and 95.8. Comparing those times to my last outing where I got some 1.9's, my MPH before was 92-93 so I picked up 2-3 miles per hour in the 1/8 which is great. However, it was 10 degrees cooler at 72 vs. 82 at the last outing. With my 3.90's and short drag radials I get all 4 gears in the 1/8. I noticed my grams/cl (cylinder loading) was up about .03 .04 with the FAST...all these factors point to the much greater flow with the FAST.

SOTP feels great, the car revs a lot faster (as seen on my HP Tuner scan logs) so I'm eager to get the to dyno and the 1/4 mile track. People always comment about how the FAST sounds different, and it does - it's loud, with a hollow sound. Surprisingly loud.

Only problem I had before and still have. My car is sluggish when you pop the gas pedal in neutral or clutch in. This wouldn't be a problem except I like to heel and toe shift and it's a pain with the sluggish response. Back in the day of tuning a Quadrajet I'd increase the accelerator pump shot, that's exactly what it feels like, a lean bog, but I can't find anywhere in HP tuners to increase the "pump shot". If anyone has any tips on how to make the car more "snappy" I'd sure appreciate it.

Thanks again to SPIN for his great work and great price and service! If you are reading this, make a paypal St. Judes donation.

 

Thanks for the post. I will be adding a ported TB and intake in the April/May timeframe. I'm waiting to see if Weiand will be available and can compete with the FAST. If not, I too will contact Spin for the FAST mod and port job.

 

Isn't there a function specifically called "acceleration fuel enrichment"?
Did you confirm via datalogging that the bog occurs because it leans out?

 

Joe, Glad it all worked out for you. The fast would never let you down.
I did a vid this morning and wound up spinning in 3 gears. Im trying to post it. but having some difficulty with CF recognizing the url. Sure I will work it out. Was going to track it bad weather must wait till nov 20.
Need some tips as the RF's are crap.

 

Looking good, Joe. Spin has done us a great service first by researching and publishing his FAST mods, and second by offering it at an unbeatable price.

Before someone else gets on you, the hole that you enlarged to 7/16" is for the MAP (manifold air pressure), not the MAF. Must have been a typo on your part. Did Spin have a chamfer or coutersink on the hole like the OEM and the hole in the top of the hump that he removed? I measured both the OEM and the FAST and they are both 13/32, with a countersink. I have pulled the MAP off my C6 and test-fit it to the original hole in the FAST, and it fits just fine.

- Lee

 

FAST is great mod, no matter how you look at it.

 

Glad to see you finally got it in. Joe was all smiles at SEMA talking about doing it when he got home. I had a real blast with Joe at SEMA. He spent a lot of time with me (what did we walk in total....20 miles or so???), I feel like I've known him my whole life...a real gentleman who has a kind word for everyone. Can't wait to see you burn the track in person.

 

2-3mph in the 1/8; its possible you have 4mph in the 1/4 then. 30hp?? You did pretty good.

I hope you removed the bulging RTV before install. As I told you in the phone call, I couldnt remove it before I shipped it since I was out of time for the work day and you needed it quick.

 

You bet I did. It looks great.

Well, I've been shifting to 4th ever since the cam. I'm not in 4th for long but if I don't shift I'm on the limiter before the traps. My tires are very short, 25" when they had tread, less now! I think 1 mph was the weather, the dyno will tell soon.

Overall great mod, thanks again for your help!

 

Very nice work there spin, the results speak for itself. Sweet.

 

Got me very interested. Trouble is someone to do the install.

 

Nice Post Joe, The before and after pictures cleared up a few things that I wasn't sure about.. This is going to be my next mod, A Fast thats been ported, modifed, installed and tuned by Spin in the very near future.

 

Great job Joe! Nice improvements.

Got Vette, Savanna is nice this time of year. For a plane ticket Spin might be talked into an install. For two tickets I'll drag him down there myself and we'll have you running in less than an hour.

 

AQ, thanks. Savannah is beautiful this time of the year all right. I'd have to have a few things in place but if I could swing it (with everything being what it is), y'all are the top guys that I'd let do it and we'd have a good time doing it. There's a great place just down the road we'd go for all the seafood you could eat, Paula Dean's, and others as well.

I would really need to have the plan in place on what y'all would recommend (i.e. FAST intake, ported TB, couplers, 4.10.s). I'd probably need to have a place to do the dyno, etc. lined up (if that's also what's needed)??? And if all that's the case, doesn't leave any $$$'s for getting the traction with new wheels and rubber. We'll see and thanks . . . very much.

 

As far as the sluggish response from Idle goes; go to the "Transient" tab under "Fuel Control" and bump up the "Warmup Transient Fuel Correct" to 14 or so and see if that helps. This should help Stomp Compensation just like the Accelerator pumps in Carbs...

 

Joe
it's about time you got the SpinFast 92 manifold!!!
Since Spin did mine my low end has been great, I still have not dyno'ed
my car, but it runs great, I'm sure my car has more in it, but I still have not learned enough about how to manipulate my HP tuners.
I'm glad you went to Sema, sound like it was worth the trip.
Hope to see you soon.
Phil

 

That's good advice, will try. Something along those lines wase recommended by Paul Brannish in his book Advanced Tuning that I read on the way to SEMA and is necessary due to the high overlap in my cam.

My buddy reviewed my tune yesterday and noted that I had low spark advance in around town driving, around 30, when the stock Z06 tune has quite a bit more, up to 10 more degrees at times. I loaded the Z06 stock spark table and scanned on my way to work today, and it was certainly a lot snappier, but I was getting some KR above 4k so I need to go back to my table at 4k up. But around the 750-2k range where you daily drive and I always thought it was sluggish, using the stock Z06 table was a very nice improvement.

I have some more work to do with VE tuning now that I've got the FAST, that should help too.

I have to say I love the scanning and tuning. It's a lot of fun.

 

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

 

^ Isaiah that's good advice. I got to the dyno today, the results are below. We ended up adding quite a bit of fuel to get to this level, about 4% of fuel from my previous dyno run, and took out some timing around torque peak, about 3-4 degrees, and added a couple of degrees up top. We were able to tweak about 10 tq and Hp at the mid point of the graph by adding fuel and tweaking timing.

Here's the results - we did 6 total runs and they were all about the same at the end so we called it a day. I have some street VE tuning to do maybe over the weekend.

 

Nice numbers Joe!