Where can I purchase the exhaust?Exhaust primaries look like they are on the small size in terms of diameter.
double plane manifold on the engine probably works best at lower RPMs. Maybe a different intake manifold would work better. after that, its depends what the rest of the package is.
Thank you for contacting us. I learned a lot. My engine E7TE runs only 6000 miles. There should be compression.A standard Renault will live a nice long life up to about 325HP (crank). This is a easy chore with a 302 CI SBF. Go on line and find the specs for a Ford Motorsports 345HP crate motor. They have about 9.5 to 1 CR. Do a compression test on you motor and if you are about 125-135 psi, then you have enough CR to make 350 HP. Next is heads. What do you have on it now. Check out the heads on that Ford crate motor above. If you are near their spec (not much of a stretch because they are not really all that excotic) they have 1.94 intake valves and 1.64 exhaust. The heads are just bored for valves and with out any port blending. Just a nice new 3 angle valve job and a little basic blending around the valve pockets will yield you another 20 HP. Once you have that much done the cam and valve springs are next. A moderate cam suitable for road use up to 5800 RPMS is plenty. Go for about 280 degrees of duration and .525 inches of lift. That will do it. Keep what you have for a intake and carb. The header you have are fine for 325 HP so keep them also.
Call Comp Cams and speak to their tech advice and tell him what you are trying to do.
One last thing. If your Renault is standard then you should not go much beyond a nice pump gas street spec as I have suggested above. Once you go beyond 350HP then things get expensive with GRBX's. First on that list is a single piece input shaft upgrade and at the same time a limited slip diff. I am in love with Quaife TBD's.
Those are BF Goodrich TA tires you have. I am guessing you have 15 inch wheels to go with them. The tire question is a whole other discussion. They will be fine on a road use car with a nice moderate engine.
My advice is not to get carried away with power until you have a full understanding what another 100 hp beyond 325 will require of the rest of the cars systems.
Well, if you want to upgrade your power, yes, the transaxle is the limitation. But you should also look at your brakes - you'll need to stop too
More power doesn’t require more braking does it, it’s still the same car being stopped?
Unless the car is getting heavier or there is a sudden change in use to a track car then surely the existing (assuming they work fine now) brakes will be absolutely fine?