MrWigggles

I'm sure the guy has solid rear axle as well. With an independent rear suspension when the car squats at launch, the tires move outwards and that makes traction tough and tires want to break free. With a solid rear axle, the tires stay the same width apart and the outwards force is no longer there.

This is one reason why a 600 HP supra and 900 HP supra often have the same slip times. Unless you go solid-rear, getting 600HP+ power to the ground is going to be difficult.

-Mr. Wigggles

Charles R. Hill

iTrader: (7)

If he is using the same unit that was in the photos of the build-up, it is a Strange assembly, most assuredly with a spool. The idea of not wanting to use an indy rear is not necesarily based on the rear wheel alignment but on the inability of the rear assembly to hold the torque. There are some 'Vettes that are running 9s and using indy rear diffs, though.

MrWigggles

If you are running "in the 9s" you are accelerating at an average of less than 1g (about .85 gs). With an 7.27s ET you are averaging 1.5gs down the track.

Once you go over 1g, traction is very difficult. I am sure an ultra-heavy duty indy rear-end could be built, but what's the point if the tires are just going to break free.

-Mr. Wigggles

Charles R. Hill

iTrader: (7)

There are different rules in different classes, obviously. The "ultra heavy duty" rear end you imagine is far from abstract. They are built by Tom's Differentials and they actually work. What is it that causes 1G to be the harsh line beyond which traction becomes difficult? I see cars all the time that have traction difficulties with less than 1G.

DOMINION

Yup same gos for all. Even F1

titaniumgr3y

guys if the total weight of that car is less than 600kg and he has more than 600whp under the hood, then, thats why he got that result.

DMRH

What an awesome machine...........

Really surprised its not a 20B-REW engine in there.

Logical that the 13B-REW gets the knod as I dont think the 13B-MSP has the same potential. Or does it..............???

REgards

Charles R. Hill

iTrader: (7)

DMRH, the ports on the Renesis are nice for the street but terrible for all-out competition, especially the exhaust ports. You can search on porting or take a look at my "rebuild" thread for more on that.

SolarYellow510

Asking why a modified-class purpose-built race car is so fast is...

Let's just say, that's an RX-8 in name and general outline only. It's basically a tube chassis drag race chassis with a little stock sheetmetal hung on it here and there. No driveline parts that can be found in an RX-8.

Why is a Camry in BORING so much faster than the ones you can buy?

zoom44

and the answer is

"Kilo and Jesus Padilla for my engine"


get an engine from Jesus Padilla

tajabaho1

I must have that engine!...........nah

JeremyG

Several of you have it figured out... it's not really an RX8. Tube chassis, fiberglass/sheetmetal "skin" for a body, completely non-stock drivetrain, etc.

It looks like the RX8 platform is coming into the "argument" phase that I witnessed in the 3000GT/Stealth platform over the last 8 years...

"What exactly is an RX8" and what records can be held?

The 3/S platform just had a 9.2 second quarter mile at 156mph on a "stock" block... but it's stock all-around... stock frame/body, etc. The mods are things like a "stroked" motor, GINORMOUS turbo, etc. But it still uses the stock 6-speed manual tranny.

Matter of fact, I personally witnessed a 9.7 second 3000GT that is DAILY DRIVEN, completely street legal. 2 years ago, there wasn't even a low 10-second car!

From what I can tell, low 13's is about the "record" for Renesis-powered RX8's that maintain the factory drivetrain/frame, etc. Basically "stock" cars with modified engines.

This will drop significantly as FI options expand. Once gains are seen, the gains will increase exponentially.

2 years ago, the fastest 3/S car was in the high 10's... I knew of only like 3 10-second cars. My car ran high 11's and was in the top 30 of the fastest we knew of. Then, all the sudden... low 10's... 9.9 seconds about 8 months ago... then a quick progression to 9.2... with 8's pretty soon to follow.

Point is, if you are talking fast 1/4 mile times, you have to be CLEAR on what the car really is. We should all get together and make a "Record Book" that separates different modifications... if the car doesn't have a Renesis, it's in a different category... if it has a tube chassis, different category, etc. etc.

That's my ramble for the night LOL