Scott, great to see this post.

One thing you need to keep in mind is that some of these cars will shift between the 1/8th and 1/4th one time, others 2 times, and others maybe none (if they shifted into 4th before 108mph for instance). Unless you can isolate that, your numbers might be skewed. Weight is not the same either on these cars. The other point is that during shifts in 2-3-4th, the revs are dropping to around 4.7k-5.5k which is rather post lag.

You want to see real performance comparisons and lag, do 60-130mph (or whatever mph) runs on an accurate datalogger and compare with the same number of shifts the time, as well as the acceleration (long G) curves. I can clearly show the lag of the EVO 750 for instance based on an AX22 run. The same with VR Alex run etc..

I think this is going on the right track, Excellent post!

 

Great number crunching Scott!!! Let's not forget some of the other variables, like my run was made in the mid to upper 80's, I can clearly see that as the weather cools down (or in my case, isn't so hellishly hot) that the car is starting to make more power and trap higher.

BTW...wish you could make the drag day...we'll be having another in spring, hope you can make that one!

 

RenntechV12

I know heat matters, but as an example, I ran 2 days ago at 97 degrees F and 78% humidity on the street and it took me 543 feet to cover 103-130mph, while you needed 660feet, and I have an aircooled car, one gear shift (4th to 5th) and 1.18 Bar. Means I would have been ahead of you by 120 feet during those 28mph gain, and I have turbos the size of a GT30.

Heat is important, but not for such a short comparison run.

 

You're absolutely right, Jean There are a few variables I'm not able to take into consideration. When I get home, I'll be getting a AX22 so that I can gather data from it as well.

Now check this out; I just found the numbers from my old timeslip, when my car was a IA/EVOMS Stage 2 and I had run 11.65 @ 126. I was full weight, AWD, and on stock K16's. Look at these numbers:

Run #1: 1/8th mile = 97 mph – 1/4 mile = 126 mph. Gain of 29 mph on the back half.

 

Scott, yes it is very difficult to compare, but one can certainly have an idea if he has some of the data such as shifts mainly. If you can add the time needed between 1/8th and 1/4th to the mph covered above, it will show even more insight. I have already done all that before

I have a spare AX22 for you here if you need it anytime while you are in Bahrain. Cheers

 

I'm with you, Joe. My 10 second runs run were made when it was 79 degrees out. Not particularly hot, but not the coolest day either. Now my 11.65 Stage 2 run was when it was a a cool 55 degrees outside. THAT was a good day to drag.

Yep...I really wish I could make it to drag day too. Jut meeting you guys would be fun enough, let alone drag racing.

 

Thaks for the offer, but my car is on it's way to Todd's place in Arkansas for more upgrades.

 

As always, you're right Jean

I'm sure your car would make mine look like it's standing still if we ran each other, it's waaaaay faster. With that being said, why don't you convince VRAlexander to come to Phoenix on December 2nd and run against me at our drag day, I still haven't heard anything about that yet

 

RenntechV12, VRAlex is a great guy I am sure, but I don't know him more than you do, although I would love to.

Based on the numbers, it does seem like my car would make yours look like it is standing still

BTW, it covers 103-130mph in less distance than VRAlex as well, so don't feel too bad. I am not doing a tuner war here, just discussing temperature and performance facts. I am a lousy drag racer, and I admit it, no big deal.

 

VRAlexander, can you please join them at the dragstrip and hopefully post some long overdue drag slips?

 

My runs were made in the middle of summer in south central Georgia, it was literally 95+ degrees and 90%+ humidity. These weather conditions have to affect performance a little bit. The 10.96 run was my 2nd or 3rd run of the day, so the motor was pretty warm too.

Cleve

 

Cleve - If it were cooler out, I have no doubt you would've been a bit quicker...but I think your car still would've made up most of it's speed in the back half of the 1/4 mile, regardless of the temperature outside. And there's nothing worng that that at all.

This comparison isn't a negative, guys. It's not showing one car or tuner being better than another. It's only showing where the majority of the acceleration comes in on different cars. I only posted it since people commonly use back-half 1/4 mile comparisons to judge lagginess of a turbo charged cars. It's not scientific..it's only a tool.

 

I would have thought my car would have been faster in the 1/8 since I have the smaller GT700 turbos...maybe I am not shifting fast enough? I do like my large MPH gain on the back half though.

Cleve

 

Cleve, your car covers the 1/8th to 1/4th in 3.78 seconds and 35mph, one of the fastest I have seen on this board, including the GT800. Heat will impact for sure over the full run, I meant to say between 100 and 130mph it would not be that important.

 

I'm also not going to get into a "tuner war" thing here- there's no point I'm also going to put my hands up and say that I have honestly have never driven or ridden in any comparative Protomitve built car to do a real comparison since we don't have any here in the Bay Area. I'm going to say this though, as far as the GT700 kit goes, there are over 100 of them (we've only done around 20 plus of those here) in the US (Mike told me yesterday) and the kit has been around for quite some time. In my opinion it _is_ the best kit that EVO has, especially for the guys that daily drive their cars in our parts. Plus it's a proven 10 second car with really useable power since it uses a smaller-style hot-side. In other words lag is not an issue on this kit. A lot of the guys in my area go to the Road Course where laggy big cars would be a concern/problem but they thoroughly enjoy the way these are set up and say for their needs it works. It did also win the Excellence Magazine shoot out in Vegas in 2004 and to my knowledge there are cars that have around 80,000 miles with this kit and still going strong! So I'm sure it has a much wider install/user-base.