subachad

Hi,

I have had my 04 Rx8 since march, it has 70k on it.

About a month ago at a track day it was fine during the first session but by the second after a hard left it would accelerate to 80 then drop down to 76 or 78 before slowly accelerating again.

Temperatures - 90+ degrees, a/c was not on

I figured it was low fuel as it is an Rx8 so even though I started with a decent amount it did drop down to about 1/4 when this happened. I filled it to about 3/4 and the problem still persisted during the 3rd session.

I just got done cleaning my "fuel sock" and I really don't think that was it. In fact, it looks fairly new.

That said, what's the process here? What should I check next, what order, etc.

I should also point out that the air filter is new and the ESS is clean... I had a scratch in my eye to prove it (wear safety glasses).

Thanks in advance,
Chad

200.mph

iTrader: (9)

sounds like fuel to me, ive heard of this issue when tracking our cars. hard left fuel moves right and doesnt get picked up. can you test your fuel pressure?

dannobre

iTrader: (3)

This is a very common issue. Easiest fix is to keep your tank above 1/2 full at the start of a session...or1/4 full at all times.

If its doing it above that you likely need a new pump.

Search for threads and solutions ...there is lots of info on this

subachad

Thanks for the replies. I knew about this before I bought the car and hence filling the tank. That didn't work though. It was 90+ degrees outside and after reading through some threads I went ahead and purchased a DW200 from BHR.

DeatschWerks Performance Fuel Pumps | Black Halo Racing

subachad

If anyone else searches this, the new fuel pump fixed this issue. Also at $120 at the time, it was much cheaper than a stock fuel pump. As for noise, I'm sometimes reminded but rarely notice.

dannobre

iTrader: (3)

It will.fix it up to a point......then it will starve itself 😎 How far you get will depend on track layout and tires

ybyrx8

I got a fuel pump (DW255 I think) and never had this problem on track anymore.