RX7Club.com - Mazda RX7 Forum - AJC13B

DID YOU SEE THAT FREAKIN LAUNCH?!? Almost all 4 tire went up in the air.

BTW, here is the post where I got the clip from, I should've done this before.

Quote:

From the Turbo FB Group
From: "Angus" <angus@t...>
Date: Tue Jul 23, 2002 6:44 pm
Subject: Update and Launches

Hi Guys,

Thought I'd give you guys an update on where my car is at currently. 1985 Mazda RX-7, with a 1990 "Series V" 13B Turbo engine, Garrett GTBB turbo, Series V Turbo gearbox and a few mods...

Well, after being away overseas for a while it was time to jump back in the car again and take it to the track. We had replaced the gearbox, and I had ordered a new intercooler. Unfortunately, the new intercooler didn't arrive in time, so we decided to run with the old one and just run low boost.

Intake temps were climbing to 73 degrees C (163F!) with ambient air 14 C (57F)! Pressure drop was pretty high so obviously we have reached peak flow with the old intercooler :) I figured we'd run anyway and check out the box and a couple of little changes.

First pass we decided to take it pretty easy, make sure the gearbox would handle a launch, and run a bit more than normal pressure in the tyres to help it spin a bit off the line. Just a simple check out pass.

A decent burnout to clean the tyres and into stage, I brought the revs up and launched, the car felt really nice and the front picked up and carried a fair way, I got all the gears pretty cleanly and ran through. Coming back down into the pits I knew that it must've been a good pass as Scott was jumping around "One Three Nine!!" and I am like "What do you mean, it can't
be 139mph!?!" And Scott is going "60 foot! 60 foot!" Nice! my first time into the 1.3 zone! :) The car also ran 10.7@1... which is a PB!

The next pass we dropped tyre pressure a pound and headed back out. Sure enough the car reeled off an easy 1.37 60 foot! I was amazed! The changes we had made were obviously working!

The next pass I just gave it a couple of extra revs off the line and sure enough it picked both front wheels up and did a 1.36 60'!!! The car ran a 10.49@1...

The next pass I missed second gear after holding first for a bit longer, just rolled through as I didn't see the point in continuing.

On my final pass, I gave her a couple of more revs off the line, the front picked up and then BANG! tinkle tinkle....oops! :) I had a handful of neutrals! :)

Fortunately there was enough mates there to push the car onto a trailer and tow her home :)

On brief inspection it looks like the output shaft has twisted and snapped taking out the yoke and cracking the back of the box as well. Time to research a different gearbox option I think :)

Here's a photo of one of the launches and you can see the 1.36 60' in this video (Thanks to Norbie for the pics and Nick for the video!) :)

http://www.fastrotor.com/angus10-4divx320.avi

Cheers,
Angus

DID YOU CATCH THIS PART?

"Unfortunately, the new intercooler didn't arrive in time, so we decided to run with the old one and just run low boost."