Another tuning question

[ryan.wilkinson]

I have a stock S2 and thought about a bit of tweaking. As I didnt want to spend £'000's I thought about gaining a few bhp by replacing the induction system, exhaust and throttle body. The first two are fine but is the replacement of the throttle body really for the S1? I looked at a 160 throttle body on Elise parts and it refers to aluminum construction being better than plastic, but mine is already aluminium. Is it really worth the change??

[DanH]

Not really imho. It changes the throttle response to be more agressive and I think in theory it is a tad wider? People have rolling roaded them and found no benefit though, so theres a suspicion that reports of better performance are due to the more agressive response.

The thing with the plastic ones on the s1 is that they could stick sometimes. Thats why the S2 one is alloy, as is the trophy one which I've just been referring to (at least I think its called the trophy one from some mgf race series?).

[340ragtop]

it's called the trophy becasue it was on the MGF Trophy

[bogie]

I wouldnt bother with the throttle body - just get an induction kit and sports exhaust...spend the money for the TB on a sports cat - they do make a difference...my car (when std) made 136bhp with the about

[paulwakinshaw]

agree with Bogie, the standard car fitted with decent exhaust, cat pipe and induction kit should be pushing out around 130-135ish

it still makes me wonder why people opted for the genuine Lotus 135 kit and paid nearly £2k when some simple bolt on mods and a decent set of cams can give similar or even better results for the same price (assuming you get a specialist to fit the cams)

I think i have read on the net somewhere that there was an independant test on a totally standard car with and with out the 160 TB and it showed a 2BHP gain.

Wako

[bogie]

I tested my car before/after TB on rolling road, same day 15 mins apart - gave 2bhp and 3lb/ft in places...but that was with a DVA155 kit fitted...on a std ish car, its just not the bottleneck

[kal-el]

If you're going to arse around with the throttle bodies you might as well go for the Jenvey DTH TB's and an Emerald ECU. Then your K-Series will realise it's full potential and the throttle response will be much better...

[djroadboy]

Yeah but I'm sure his original point was that he didn't want to spend a fortune.

TBs + Emerald + Fuel rail + Airbox + Filter = Lots of wedge! (at least 1500 quid)

Dan