OK Yesterday i was driving around in near Scottsdale when i saw a red RX-8 at at used car dealership, while i was talking to manager of the dealership he told told me that he just had it dynoed and it was make almost 400hp with the NOS injected to the intercoole running on about 5psi boost.

 

.....crank maybe, wheels no.

He'd have to be making ~300 rwhp at the crank to claim that, which is possible

 

^^^
second that.

 

I've never seen a used car manager taking used cars to a dyno.

on 5 psi, I would have my doubts on it making 400 hp.

 

i know but here in az i have been to a coulpe of used car dealership where some of them had the old fc's but they usually deal with high performance used cars

 

Most likely scenario is, the sales guy was lying through his teeth.

Car salesmen work with lies in the same sort of way that Picasso worked with paint, or Shakespeare worked with prose, or Beethoven worked with a piano.

 

The important point is how long can the car make 400hp

 

no no no the important point is did he ever get it dynoed.. and how the hell does it have 400 hp with 5psi..

 

Well, if he makes say, 250 with 5 psi say, and then tosses in a shot of N2O for another 50 rwhp, then its feasible.

Although, hes a dealer, so he probably doesnt know what hes talking about.

just drill him with questions:

1. What kind of dyno was used, and what SAE smoothing facor was used?
2. Was the hp figures at the wheels, or the crank?
3. how big of a shot of nitro, and are you sure you dont mean a shot of it infront of the intercooler to cool the charge?
4. What kind of engine management are you using on the car?
5. Whats the AFR when under full load?
6. How long has it been boosted?
7. When do you get full boost?


Etc. etc..

If hes getting 5 PSI, hes running off the wastegate spring, and hes getting max 250, with a good ECU..... and if he IS running nitrous, then:

Is it a direct port conversion?
What kind of shot is it? Dry? Wet? Purple? Pink?
What brand do you use, ZEX, NOS, VENOM, Nitrous Express???
Wheres the trigger located?


See what kind of answers you get

 

Before you get all technical on him, ask him to open the hood and point out the turbo.

I actually had a salesman point out an alternator once and insist it was a supercharger. No lie. Lots of people simply have a hobby of using big words they heard on Fast and the Furious. Speaking of which, ask him he's ever pushed his car hard enough to trigger the computer warning for blown manifold welds.

 

I smell some real big BS. With a Greddy kit, you have to turn up the boost big time to get to 300 whp. In the 10-12 psi range. On top of that I believe Charles R. Hill is on the leading edge of nitrous technology for the RX8, and his direct port unit is just now coming on line. In the past people running nitrous were doing 55 shot. 75 was done, but with stock hardware, and even then people started getting detonation. 300 whp is not 400 hp, about 340 is. The spray units that blow CO2 or NO2 on the IC were not giving nearly that kind've results.

Even at 5 psi with a nice tune, assume 250 whp, then another 50 whp (generous) with a Zex Wet kit with 55 shot, which I have never even seen (turbo & nitrous), that is still at around 300 whp.

Even the GT35R kits are only getting around 330-350 whp but that is with 10 psi+ of boost.

Get the BS-O-Meter out.

 

let me help you guys with that.....



there is no wayyyyy maybe 300 - 330 max not 400 he is just trying to sell the car and get to his $
with 7 psi i am getting 250 with the Interx... i can get it to 270 with midpipe and exhust but i don't have the money anyways ... sooo

 

If anyone was throwing down those numbers , someone on this group would have heard about it.

 

Sorry to threadjack but reading this reminded me of this story .

Me (looking under the hood) : Where is the battery on this car ?
Salesman : Oh they don't have one in these cars . (Nissan Skyline)
Me : really ? I never heard about this amazing breakthrough in technology ?
Salesman : yes they are doing amazing things these days .
Me : Can I take a look in the boot ?
(I then pop the boot & go around and open it up)
Me : ( trying real hard not to laugh)Oh , there it is .
Salesman then goes bright red & mumbles something about being new & dissapears back into his office.

 

Many stock Rx7's blocks make 400whp all day long.

 

I completely agree, there's about a 15% power loss in the manuals so just like you said 400hp is about 340rwhp and so on, but he also said that the NOS was being sparyed at the intercooler and not into the intake charge or where ever it goes. So if it's being sprayed at the intercooler there's even a lesser chance of him making 400hp considering that you don't get this enourmos power boost from doing that, it just basically gives a little cooler charge of air to go through the turbo and intake area.

 

Damn it seems like it is hell trying to make power from these cars.

 

RX803, not really... but the greddy turbo is small, so you're not going to see much more than 300 from it.

 

Yeah, I had the CO2 IC Sprayer, and it didn't make anywhere near that kind've power. Looked kind've cool though.

 

What if you take the brackets and replace them as follows:
1) place that will sell you someone else's broken car for 50% more than its worth
2) some dude who sells used cars for a living
3) the guy who traded it in had said he might have
4) 280 whp with 30% (which is very high for a manual) assumed drive train loss which might be 400 bhp.

I think that will sum to an occurance that could exactly be described as the op has and yet still reflect what most of us expect.