i estimated that my car will have 170hp after adding a rb exhaust. 135 stock + 5 hp (est.) for intake + 20% increase from exhaust = 170 hp. Does this number seem reasonable? i used this number in a calculator on www.rx7.com and it said with that amount of hp i would be running 14.5s in the 1/4 mile. Would this estimate be relatively close? does any one know what the 0-60 times might be with these mods? thanks.

 

My guess is that 170 is optimistic. It depends on the overall condition of your engine, but with stock porting and a free flowing exhaust, I'd guess you'll be around 145 or 150 flywheel HP.

 

yea, i dont even think im at 170 rwhp and i have a stage 2 streetport with rb exhaust and cold air intake

 

I'm just under 170 RWHP with ALOT of engine, intake and exhaust mods on a high compression engine.

I've seen before that driveline losses are about 20% on these cars, so the 145 hp GSL-SE is probably at about 115-120 at the wheels, so about 15.5 quarter mile time.

 

really? you guys think it will be that low? that kindof sucks. but i guess in a few weeks we will see how it works out

 

Max7 had pretrty much the same mods on his -SE and dynoed at 135 at the wheels, or about 150 at the crank.

He did run a car at 14.9 (different car, same setup) with a slipping clutch, at I think 2400lb plus driver.

 

peejay is correct, in my 84 GSL-SE with single RB exhaust, cone filter, working 6 ports, cold air intake, MSD direct fire, Secondary Throttle plates removed, 100k+ on motor and a slightly slipping clutch ran a 14.942 @ 92.61MPH running out 3rd gear on Nitto 555R drag Radials. at about 2440lbs no driver.

A fellow racer in his ITA 85 GSL-SE with stock motor and all the bolt ons, stripped interior and cage ran a 14.5 ish

a pic of both of us racing is here --> http://rx-7.org/events/images/Norwalk2000_final.jpg

He took 1st and I took 2nd out of 51 cars that weekend, show'd dem Hundaz a thing or two

 

What do you mean by secondary plates removed?? What did this do for you?? Just bought an se (have an 84gs)

 

That's really light for an SE. There must be some interior parts removed. Normally, I'd expect a wet SE with driver to be more like 2600-2700 pounds. This is why my est. is at 15.5 sec.

 

The throttle bodies on rotarys have two sets of throttle plates in series.

 

My se weighs 2440 with a full tank of gas, but that does not include me. With me included it is 2610.