The MGF originally came in two varients 1.8 MPi (approx 120 bhp) and 1,8 VVC (approx 145 bhp). There were various Limited and Special Editions - one of these being the Trophy 160. This got it's extra power by tuning the VVC engine. Around 2000 1.6 MGFs and Steptronic MGFs were introduced. As Andy says the Steptronic used the MPi engine because the ZF box couldn't take the torque and probably the higher revs of the VVC engine. When the TF was introduced the 1.8 MPi engine got better breathing and slightly hotter cams which upped the power to approx 135 bhp. The VVC engine was standardised at approx 160 bhp like the Trophy before. However, the limiting factors of the auto box were still there and so the TF120 kept the old MGF 1.8 MPi engine. I'm not sure what the MGF 1.6 produced, but in the TF 115 this 1.6 engine is obviously in a higher state of tune than the 1.8 TF 120 one to be almost producing the same amount of power. However, I suspect that it might be down on torque..
Thanks to the people who originally posted these notes.The TF120 and the TF135 both have identical torque figures, its just that the TF120 engine produces it 2000rpm lower than the 135 varient. This more grunty bottom end delivery obviously suits the steptronic autobox better than the higher revving, but less torquey at low revs TF135 unit. The TF120 engine would probably go just as well as the 135 does if it had a manual box, and certainely the in gear acceleration would be as quick if not not quicker, the 120bhp engine as fitted in the MGF does feel quite a bit more pokey at under 3000rpm than the 135 version. The 0-60 and top speed are obviously better with 135bhp, as the downside to the 120bhp engine is that it tails off quickly at over 5500rpm, and revving past 6000 is utterly pointless.
The TF115 has the same camshafts as the TF135 which increases power from 110bhp to 115bhp. It still has the plastic inlet manifold and 48mm TB though, which IMO is very likely why the power and torque of the TF115 are at different points to that on the 135 engine.
Do like I did, search for TF!£% CAMS and read Rob Bell's posts on the problems of matching 135 cams to mpi dissie.fecae2000 said:really umm intresting would it be a straight swap with my mgf camms i mean do they use different pullies and ecu's???? as well???
We tested the aftermarket systems available in, hmmm 1999 i believe for MG World magazine (now defunct) and do you know what the biggest conclusion of the day was? That the standard system isn't all that bad! :lol: We threw the best the aftermarket could offer at the car and only came up with a +5 bhp gain, so if you are going down the custom made route - BE VERY CAREFUL - as you could actually end up loosing power.fecae2000 said:
fecae2000 said:what is the difference between my mgf 120bhp 1.8i and the tf 1.8i 135bhp???
is it all throttle body's like the rovers 85psi and 105psi????