Just think about what that throttle pedal does...

Yesterday a mate of mine had his SW20 turbo tuned on the same dyno as my car.
When I was talking to him about his dyno graph (which I won't post here), I happened to notice something interesting compared to my dyno graph. Mine is shown again below.
 

 
Notice how the horizontal axis shows both the RPM and the km/h. The dyno calculates the RPM very accurately using one of the spark outputs from the ECU, while the km/h is calculated from the diameter and speed of the dyno rollers.
 
On my mate's graph, his RPM vs km/h matched perfectly with mine at low RPM, up to about 4000rpm (where the boost really starts to increase rapidly on mine).
However, at 5140rpm my graph shows 130km/h but his shows about 140km/h, and at about 7000rpm mine shows 180km/h but his shows 200km/h.
 
This means that when my car was on the dyno for the E85 tune, the tyres must have been slipping significantly against the rollers, all the way from 4000rpm to redline. There is a km/h discrepancy of about 10% at 7000rpm, which is quite a lot of wheelspin on the rollers, therefore my dyno graph would have shown an even higher power figure if there was no wheelspin!
 
My tyres can't even put all the power to the ground on the street either, so it certainly doesn't bother me, I just thought it was a bit amusing.

So that mean you would have been arround 370-380kw?

I don't know how you drive somthing like that lol

Eric
So that mean you would have been arround 370-380kw?

Yep!

Eric
I don't know how you drive somthing like that lol

With such a high power/weight ratio, I honestly can't just jump in the car and drive it with my brain in autopilot mode like a 'normal' car (unless I only intend to cruise around mostly off boost...the car is easy to drive in that case).
Normally before I set off in this car, I have to get myself into the right mood, in the zone.
If I apply anything over about 40% throttle, I have to be completely focused and prepared for the tyres to break loose if I apply more throttle. I don't think it will ever stop feeling frighteningly fast and exhilarating.

im not sure if the gearing is same in all e153 gearbox and lsd types, but u can get over 180km in 4th gear, i think around 200 and 7200rpm. dont ask how i know ;), man i love your car, this keeps me inspired, i just need a few bits and pieces.

Congratulations!   Great development and obviously done thoroughly.Thanks  for your write-up.
Interestingly I was only talking to Steve a few days ago about tyre slip on chassis dynos. Can be very difficult.
Most E153s are the same final drive ratio 4.285 in the MR2.
Im keen for a passenger ride when you come up to Qld !!      Cheers.

You'll have a heart attack Doug I know I would!

robk


My goal is to have at least 250kW at the wheels, maybe up to 280kW depending on how I do things.

 
I think you reached that goal you set back in 2010...

In the very first post in this thread, I recently added an index of page numbers for some of the highlights and most useful info in this build thread.
This idea was suggested by one of the moderators, because this is the largest thread on the entire forum!
 
Given the huge number of views that this build thread has had, there will probably be at least a few people who will decide to read the entire thread starting from page 1. I've always regularly updated the first post on page 1 (with the lastest list of mods, etc), so I decided to update lots of the older posts in this thread that may have otherwise seemed out-of-context in relation to the latest mods on the car.
 
 

Dudeman

robk
My goal is to have at least 250kW at the wheels, maybe up to 280kW depending on how I do things.

I think you reached that goal you set back in 2010...

Haha yeah! I saw that original post while reading through this entire thread to make the page index that I mentioned above.
With the previous mods that I had from about 2011-2013, my power figure was right in the middle of that target range.
Now I'm about 100kW beyond the low end of my old target power figure, thanks to E85!

Eric
If you're ever up in Queensland, can you take me for a spin? a fellow black mr2 owners dream :P

Falcon
Im keen for a passenger ride when you come up to Qld!!

Is there any chance that either of you can travel down to the 30th Anniversary event in Sydney on the 28th? That might be your only chance for a passenger ride.