Monty

There were a few guys interested in my setup and they had asked me for some driving impressions/feedback. I'm usually not one to drive reckless, but I couldn't resist a few times today, and lit the tires up. The car got squirrelly on me a few times, especially when I punched it a little. It's a darned fun ride!

I know alot of people are under the impression that turbo lag is something to worry about, or that turbo's don't produce tremendous low end torque and are high rpm power adders. Neither of which is necessarily true, and my experience today supports that. While you don't really get into boost under normal city driving. The engine actually idles and run with around 10" of vacuum, which is nice for a 256/256 solid roller - the 115 LSA helps. I can spool the turbos up at ease by simply depressing the throttle with authority, and the inherent torque of the SBC 427 is plenty to get the car motivated without or prior to boost.

I only got into boost a couple of times, and even then it was 5psi or less. I swapped the 20psi wastegate springs I used when I dyno tested for 5# springs for the street. I can still turn the boost up with the boost controller if I wanted to, but it is not needed. Radpidly applying about 25% throttle from 1000-4000 rpm results in lighting the tires up. One time today, I didn't even realize the tires were spinning until I looked up in the rear view mirror and saw, then smelled, burning rubber. My brother in law calls them "asphault crayons" which I thought was pretty witty.

http://www.montygwilliams.com/testrun1.mpg

Timz2882

iTrader: (1)

nice very nice, by the way did u go over that posted 35 speed limit sign u past in a second lol

Monty

I haven't connected my speedo up yet, so I plead ignorance to that one, lol!

Here's another one, you can definitely hear the wastegates and BOV's in this one.

http://www.montygwilliams.com/testrun2.mpg

Timz2882

iTrader: (1)

nice me likly :hail: :hail:

BOTLFED

I love it Monty, very nice work..

I definatly want to see some WOT passes..

Cheers,

bbunting

Monty-that is quiet!!! Can't wait to see some out of car footage.

I think what the guys are looking for is something like this:

WOT

However you try to put down 1000 RWHP will be fun to watch:hail:

83 Crossfire TA

iTrader: (2)

somebody care to put the files up on a less cranky server?

I've had the download time out and restart a dozen times now and never get the whole thing (and since the server doesn't support resume I can't just pick up where it stopped).

DreamState21x

Really nice car.. Must be fun as hell to drive.. you should take it to the track and get us some time slips....:hail: Really nice car tho...

90firebird

oh my goodness, what a f*cking sleeper! are those OE wheels? i've always loved the muscular profiles of those C3 vettes, but they seem to be strangled by the damn emissions equipment (stock). you will definitly shock everyone when you hand their a$$es to them!
i have a puny 3.1 rated at 140 hp stock, but with the power its making now, it would most likely take 10 of mine to equal the power of your vette's
:hail: monty

Monty

Thanks guys. I've only got a couple hundred miles on the car, and that's an estimate as I haven't connected the speedo up yet, so I haven't really done any WOT runs yet. I would even try to do so on the street anyway. Even with about 50% throttle from 4000-5500 rpm at about 5-7 psi ,it breaks traction and the car gets sideways. The engine is capable of and tuned for around 25 psi and 7500 rpm at WOT on the dyno. I doubt I will ever do that on the street. To be honest, the massive amount of power is still taking some getting used to and that's with the boost controller totally closed. I still need to tune it for part throttle drivability, it's still a little rough below 3500 rpm or so, especially with light throttle from a standing stop. I think Precision Industries didn't believe my power/torque claims when I ordered the Vigilante converter, becuase I asked for a 3000-3200 stall converter and it's probably a good 500 more than that. I might send it back to get it tightened up some.

83 Crossfire TA

iTrader: (2)

Pretty cool… (I got a buddy of mine with a much faster connection to download it and put it on his server, I never did get yours working). Any guesses at the HP that it’s making at that 5-7psi?

Don’t worry, like any car after about 2 weeks of driving it around you’ll get used to it and be looking for more power


I hate to say it but if you consider that reckless, well, then I’m betting that half the list members here belong in jail…

Rob116

Huh. Nice. That's the sweetest street legal ride I've ever seen - I love it! So unique!

f-crazy

iTrader: (-1)

a good point was brought up...this is alot of power...it wil take a big learing curve to harness that power...after all how many uof us have drivin an 1100 hp car before?....maybe 11 sec

just be carefull!!!

Kingtal0n

Monty my MAIN curiosity if just what kind of fuel economy you can get with that setup. It will be very interesting if you can squeeze 20+ mpg from a 427 making 1100 horsepower.

that would once and for all blow away the whole "bigger engines use more fuel" idea that everyone seems to have. I think you can do it, with the right tuning i think any engine can get considerable fuel economy.

Monty

I think 20+ mpg is entirely possible, obviously it depends on how you drive it. It's not like I have it at WOT all the time and it's always making 1200hp.

My engine is only turning 1500-2000 rpm when cruising, or during normal driving in traffic, I have the A/F target set at around 15:1 in that area of my fuel map. I still need to do some tuning in that area of the map because we didn't really touch that during dyno testing/tuning so right now it's running a bit rich and rough up until about 3500 rpm.

Right now I'm probably getting about 10 mpg or so. Everytime I plan on doing some tuning it either rains or snows, or something else comes up. I hope to spend some time with the laptop tomorrow afternoon if it's not raining. I'll let you know what my mileage works out to be after that

B4Ctom1

I think you should haul that baby out to the salt flats, hehe 200 here we come?

Monty

I wouldn't drive it that fast. These old Corvettes have a tendency to get light in the front end above 130-140. Having rebuilt practically the entire car in my garage by myself, I wouldn't trust it at those speeds .

I just cruise around and do an occassional burnout when no one is looking...

bbunting

Monty- here is an idea for you- slap some Hoosiers on that bad boy, and come out to the road course. In a controlled environment, you might be surprised how well it handles. Especially after reading the specs on your suspension! It would be more fun than stealth burnouts IMHO.

Like Road America for example. :hail:


PS-check RA in sig as an example

B4Ctom1

OH YEAH!

Kingtal0n

<b> I have the A/F target set at around 15:1 in that area of my fuel map</b>

Which reminds me, how are you tuning that beast?

What kind of management system are you using, how is it working, how many "options" are there, and basically im just curious how different it is from the commander 950 im using...

Monty

FAST sequential box with wide-band O2 and Individual Cylinder Control. I've had this ECM for abour 3 years and it has always worked very well for me. I had the old DFI 6.32 and was going to wait for the DFI 7 to come out, but got tired of waiting on it.

It fits my needs, although I wish it would also control my electric fans, but I had to give that up for sequential and ICC. The new FAST won't require making that compromise. I'l either going to upgrade to that when it comes out, or Big Stuff III. From what I've been told about Big Stuff III, it will include traction control and wastegate/boost control. That would allow you to control boost off the line and increase it as traction is regained.

Bbhunting - cool videos!

Kingtal0n

well now, FAST sounds expensive, where does one get somthing like that?

Not that I want to get one, mind you

devianb

That is just rediculous. Insane is all I have to say!!!!!!!!!!


I'm surprised your trans can handle all that power. Great job - I wish I had the initiative and capital to do something that [sic].

B4Ctom1

monty there is something wrong with the first two videos but the only thing wrong in the third one is the lack of traction

Monty

I finally had an opportunity to do some street tuning on the car. Jeff from Fast Times rode around with me for awhile on Friday with his laptop and the engine runs alot better now and gets much better gas mileage.

Prior to the additional tuning, the idle was a little rough, you often times had to give it a little throttle while cranking to get it to start, and it ran rough and sputtered up until about 3000 rpm. It was running as rich as 10.5:1 at light load, so we ended up taking a bunch of fuel out and it now idles and runs at light load cruise rpm around 14.5:1. fuel efficiency is improved greatly as a result. I went from around 5-7 mpg to at least 15. With a 24 gallon tank, I went through 14 gallons of gas in a little under 100 miles. I put another 60 miles or so on it over the weekend and the gas guage is still on F. I'll know exactly what the fuel economy turns out to be when I fill it up next time, but it's obvious that it's greatly improved.

Like I was telling Jeff on Friday, it's amazing that with EFI and turbos you can reliably drive around a 1200hp car all day in traffic on pump gas without it overheating, etc. It's even more amazing when you can get reasonably good fuel economy and efficiency as well.

bbunting

Monty-you have really raised the bar so high that I am thinking of buying a GEO Metro and getting a library card. Great work.

B4Ctom1

LMFAO!!! no chit man, no chit. Hey Monty how about a back half project for that baby?

Monty

The thought has briefly crossed my mind. Briefly. This is a street car, and the suspension is really set up more for road racing and "street fighting" than drag racing. I don't really care about maximizing it's 1/4 mile performance.

I don't know about the raising the bar thing. Alot of you guys gave me a hard time a little over a year ago for referring to John Meany's TT C4 so much. My setup is basically just a copy of his. Meany and Trepanier are the one's that raised the bar, I just tried to copy it, and give it my own personal touch. There are plenty of other very nice setups around here as well. Each of them have their own merits.

B4Ctom1

I was just curious, I was dreaming about what a power plant like yours would run in a 1800# rail with a glide and a brake? Im really sick though how about in a malibu wagon with a set of bolt on spoke hubcaps?

bbunting

Well all I can say is that at least it is not a 3rd Gen!!!!

B4Ctom1

how about in a pickup?