Tuning in third gear? You got to be kidding. I tune in fifth with as many people in the car as I can find. Third does not load the car like fifth. A dyno pull that last 5 seconds also does a poor job of mimicking a pull on the streat that lasts 10-15 seconds.

 

Different strokes for different folks. Obviously he has been effective with it, he does have a company that's kinda a big deal...

 

You gotta be joking. Telling Dave how to tune.. I guess it works as he has ran a 7 sec in a 4g63. But then again you didn't tune your car, Nic from Precision did.

 

lets throw a 2.4 stroked 30r or 35r in the mix.....teehehehehe

 

For the GT35R car is that a limit with alky only 25psi ?

 

why does it always have to turn negative..dave is just trying to provide benefitial information for us. Lets just be happy and leave it at that..

 

Exactly, people always come in and give negative remarks to the mans hard work. I don't see anyone else doing what Buschur does and posting it for FREE.

Dave keep up the good work and the information you provide is invaluable .

 

I would never recommend tuning in 5th, especially with a bunch of people in the car. Tuning to 160mph with a load of passengers?

Tuning at the track>Tuning on the dyno>Tuning 4th on the street as the last gear you throw in the 1/4mi>Tuning with my Labrador watching my A/F ratio in the passenger seat>Tuning in 5th with 4 of my fat friends while driving uphill at 160mph with a trunk full of phone books.

 

Not intended to be a recommendation of how to tune. Only a point that third gear does not load the car well enough in my experience. Most people cant drive safely in third much less fifth.

 

The 20G-9 should make more or equal power to any of the 30R's w/ similiar mods. The 35R compared to the 20G-9 is like comparing apples to oranges. They are tottally different just for the simple fact that the GT35R doesnt really become efficient until you start getting close to 30psi. One is a pump/race turbo and the other is a straight-up race gas turbo.

~fred

 

I agree that the power numbers are slightly higher when you dyno in 4th gear compared to 3rd, or 3rd compared to 2nd etc. On our dyno it is very minimal and sometimes makes no difference at all. I do not agree that the car will use more fuel in the higher gears or that a dyno will not load the car hard enough. If you are using a normal inertia dyno like a Dynojet then I agree. Use an Eddy Current dyno like my Mustang dyno and it will load it exactly like the road. I also find the higher the gear you pull the car in the richer the AFR's go. So in 3rd you may set the car up to run 11.5:1 AFR's and if you do a pull in 4th the AFR's will drop to 11.2:1, for example.

The 20G-8 made more power than the 20g-9 that is on my car simply because the 20G-8 was run on race gas and higher boost.

I can dig up a time table for a normal BR Stage 4 car with the stock turbo. I'll try to do it today.

David Buschur
www.buschurracing.com

 

Yes, the 20g-9 would work really well with a stroker.

We discussed this topic hear yesterday after I made it. There are 5 EVO's owned in our shop so we were discussing how we would be cruising at 35 mph. Everyone here agreed that you would be in either 4th or 5th gear in a 35 mph zone. Personally if I was in 5th I would not drop the car to 2nd gear, although that would put the GT35R where it needed to be. None of us thought that we would drop below 3rd. I think dropping the GT35R to 2nd wouldn't do much good unless you are one very good shifter as you would have the lost time to go to 3rd.

Guys, of all the people on here I know a GT35R will whip up on this 20G in a flat our race. I was just making a point of how well the turbo spools and how fun it is to drive.

As for the example of the GT42R, that's comparable to the GT40 example I gave. That GT40 car I posted has run 10.1 at 144 MPH in the 1/4, but in this particular test (which I know is limited by MY parameters) it would still get beat by the old 20G.

At best this combination on my car right now (pump gas) is probably good for 11.20's at 124 mph, at best.

David Buschur
www.buschurracing.com

 

O.K. Here we go. More information, as requested. Now that I did what you guys want, do what I want, call and order something

BR Stage 4, Stock head, stock shortblock, HKS 272 cams, 94 octane + alky, AEM EMS, stock 9.8 EVO turbo, manifold and 02 housing.

3,000 rpm (32 mph) to 7,000 rpm (75 mph) in 4.54 seconds.

Keiths' GT35R equipped pump gas/alky car from above, ran from 5500 rpm to 7,000 rpm, does it in 1.45 seconds

My RS from above, ran from 5500 rpm to 7,000 rpm, does it in 1.65 seconds. SO the GT35R does win the race once it is spooled up and in its sweet spot. That's no surprise as I said. For me it's the waiting for the sweet spot just driving around that I don't like

David Buschur
www.buschurracing.com

 

Speaking of dynos~ off topic for a second... Dave, I saw you at the PRI show in Orlando Sat. Well sort of... I didn't know you are the spokesperson for Mustang now . Nice feature film on the plasma screen in the Mustang Dyno booth courtesy of David Buschur. Facility looks nice from the video. I'm sure you got a NICE discount on the rollers for that starring role .

 

Just noticed a post I missed.

It's funny for some of you to criticize the way I tune. As far as I know there are two guys that have gone faster than I have with a 4g63, that would be Brent Rau and John Shepherd, I built Shepherd's engine so I atleast had some part in that one. I think I can handle the tuning and it's fairly obvious the way I am doing it works. I've only tuned a few hundred EVO's so far and non have had any problems being tuned in 3rd gear.

David Buschur
www.buschurracing.com