from what i understand, at those speeds, its more about controlling the airflow around the car smoothly. its a whole different thing then road racing. sorry about the whole hijack, but Racehead, have you seen any RX7 ORR cars?

 

Yes I have seen a few including a 475 rwhp monster. I have heard repeatedly that they need help above 160-170 mph or so. Specifically they need an air dam on the front to keep air from under the car and a wing on the back to keep them planted. I've also heard that because of their short wheel base they are somewhat skittish during crosswinds and they get steered quite a bit by rough air action. Fantastic track car though

 

Brandon,

I owned a LS1 FD RX7 for a while, but I was a little off on my math.

152mph is the stop speed of a STOCK Ls1/T56 combo with stock tire height.

It has nothing to do with aero or anything else, its just gearing.

Stock redline, stock RX7 gear = 152mph on a stock sized tire.

Plus 7000rpm redline isn't something you just snap your fingers and make happen, you have to make power at 7k, which for sure is possible but the difference between 6200 and 7000 is huge, big bux to run 7k consistently and have it hold together well.

You need to go down in gear or up in tire height to go faster, or as you say increase the redline and be able to pull that high.

 

bolt on A4 LS1 Fbody running against you?

 

what gearing can be run in an RX7? stock is somewhere around a 3.90 or 4.11 right?

 

manual tranny rx7's have 4.10's stock. automatics come with 3.90's.

 

Auto's came with 3.90's and manuals with 4.11's(4.10?).

There was a guy who was making a bracket kit to run a Cobra pumpkin but there were some issues with it I believe on some cars. I don't know if those were a few isolated cases but it was one of the big things that lead me to sell my car.

I wanted 3.42 gears and to invest $2,500 on something that wasn't totally proven didn't interest me.

IMO its the only thing that takes away from the car. Mazda made a 3.62 R&P that was used in the old B trucks but I think it only fit the Miata carrier, not the RX7 and they are nearly impossible to find these days to even test with.

 

yeah, but this guy revs it out to 7k..and if not...400hp should be enough to pull a lil in 6th gear..i could be wrong about that though.