Exhaust Manifold

[ragt20]

well guys....can anyone tell me wot sort of gains I would get if I changed the stock manifold on my UK spec P11GT..........and two if the manifold I'm thinking of would even fit........ manifold would be off a BTCC primera, well made for one anyway.....plus I assume the header would need to be changed..........

[P10DET]

Originally posted by ragt20
well guys....can anyone tell me wot sort of gains I would get if I changed the stock manifold on my UK spec P11GT..........and two if the manifold I'm thinking of would even fit........ manifold would be off a BTCC primera, well made for one anyway.....plus I assume the header would need to be changed..........

The manifolds from a BTCC SR20 will not fit a production SR20. They extensively modify the head, including turing it around so the intake points towards the front and the exhaust points towards the back.

[Anthony]

If it is any help Gurpal, Kevin (P11GT on these boards) has just swapped his GT spec exhaust manifold for a Hotshot one, and has reported nice increases from his butt dyno

[ragt20]

I'll have to come back on this one, cause the guy who's selling this was sure it would go on my car + give gains of upto 20hp....will have to talk to him again b4 I decide anything........

[P10DET]

Originally posted by ragt20
I'll have to come back on this one, cause the guy who's selling this was sure it would go on my car + give gains of upto 20hp....will have to talk to him again b4 I decide anything........

This guy is talking out is blow hole.

No bloody way it's going to give you 20 hp. Even the best headers (extractors) on the market give that much hp. If it's a Primera GT manifold (not BTCC) it will probably give you about 5-6 hp.

[P11GT]

Hey, im here.

The Hotshot does give a good increase in torque across the rev range, but until i get it dyno'd, i cant show you the difference. Be patient, a graoh ccan say more than a thousand words.

[Anthony]

Originally posted by P10DET
No bloody way it's going to give you 20 hp. Even the best headers (extractors) on the market give that much hp. If it's a Primera GT manifold (not BTCC) it will probably give you about 5-6 hp.

He already has a Primera GT manifold, so there is absolutely *NO* way that manifold is going to get 20bhp. You *might* get 10bhp, but even that sounds a little optimistic to me.... I think that 5-6bhp is a more likely figure

[Neil82]

Anthony I can't get onto MSN, can you? I am going to collect my GT bits today from the post office, so I should have them fitted within a week. A full reveiw will be included on Primeraweb.co.uk plus I am doing a b4 and after videod 0-60 run of my car so we can see the differnce between the Sri spec and GT spec engine.

Neil

P.S Anthony did you manage to get hold of those p/w, usernames?

[Anthony]

Messenger has been working fine for me all day. Hmmm. I'll email you the gubbins you want...

[TeamNissan]

On www.hotshot.com it sayus that the header will give you 10HP and 12Nm

[ragt20]

Originally posted by P10DET


The manifolds from a BTCC SR20 will not fit a production SR20. They extensively modify the head, including turing it around so the intake points towards the front and the exhaust points towards the back.

ok latest on this....talked again to the guy selling the manifold, apperantly the manifold is for the '95 spec BTCC primera, which allegedly accordiing to him had the engine facing the same direction as the production SR20......apparently Nissan changed the engines round after 96...he also mentioned that it would be a better fit on the SR20DETs...I'm waiting for him to send pics of it..........

[T4 Primera]

Originally posted by ragt20


ok latest on this....talked again to the guy selling the manifold, apperantly the manifold is for the '95 spec BTCC primera, which allegedly accordiing to him had the engine facing the same direction as the production SR20......apparently Nissan changed the engines round after 96...he also mentioned that it would be a better fit on the SR20DETs...I'm waiting for him to send pics of it..........

I would be very wary of the stuff this guy who's selling the BTCC manifold is saying.

IF it is a genuine BTCC manifold and IF it does fit on your car, chances are it was developed to work with very wild cams in a very narrow rpm range. It would probably hurt performance in a car with street cams.

[P10DET]

Originally posted by T4 Primera
I would be very wary of the stuff this guy who's selling the BTCC manifold is saying.

IF it is a genuine BTCC manifold and IF it does fit on your car, chances are it was developed to work with very wild cams in a very narrow rpm range. It would probably hurt performance in a car with street cams.

Not only that, but I doubt it would fit a road car. Unless it was forbidden in 95 (I doubt it) the engine was probably relocated in the chassis. They are usually laid down a bit to lower the CG.

That said, buying race car parts for a road car sometimes works out OK, but usually it sucks. Part of the reason is like T4 said above. Race car parts are produced to work in a very specific, limited environment. There are often road car parts that are very similar, but usually not the same.

For example:

Racing brakes on a road car is a disaster waiting to happen
Cams for a race car will totally suck on a road car
Ditto for exhaust
Suspensions for a race car usually just won't work on a road car since race cars usually have a much more limited range of travel

[ragt20]

thanx guys ...suppose thats what forums like these are there for.........:sun: :sun:

[TeamNissan]

I have to agree with T4

The BTCC manifolds are NOT build to fit our exhaust and engine setup, also because many of them is handbuild to fit exactly THAT and ONLY THAT engineroom it is build for!

Originally posted by T4 Primera
I would be very wary of the stuff this guy who's selling the BTCC manifold is saying.

IF it is a genuine BTCC manifold and IF it does fit on your car, chances are it was developed to work with very wild cams in a very narrow rpm range. It would probably hurt performance in a car with street cams.