Moderators: eastlmark, BIG_MVS, phildini, Test Moderator, Alpineandy
Non Member
1499
Thu Apr 29, 2004 1:03 pm
Horley - Nr Gatwick
Non Member
994
Tue Jul 20, 2004 12:14 pm
West Moors, Dorset
Non Member
3474
Thu Apr 15, 2004 8:10 am
Colchester, Essex
Non Member
3474
Thu Apr 15, 2004 8:10 am
Colchester, Essex
clee wrote:I would always sacrifice extra grunt for less lag :
Non Member
3474
Thu Apr 15, 2004 8:10 am
Colchester, Essex
red leo wrote:My celica had a twin entry turbo does anyone know if one can be fitted to the gta as this helps stop lag etc
gt5 wrote:lag wouldnt really bother me as my old 5gtt had a t28 and was laggy and i loved the way the power kicked in felt as if it had about 400bhp but down the twisties it was harder to keep on boost still didnt get beat by much
Non Member
3474
Thu Apr 15, 2004 8:10 am
Colchester, Essex
Non Member
1514
Tue Apr 12, 2005 12:24 am
Nr Chippenham, Wiltshire
David Gentleman wrote: because the cams are chain driven and the pulleys fixed, its not like you can advance the cams manually to bring the exhaust valve in earlier as you could on say a Renault 5, or 21..
Non Member
1514
Tue Apr 12, 2005 12:24 am
Nr Chippenham, Wiltshire
Non Member
10431
Fri May 28, 2004 11:58 am
Derbyshire
Non Member
3474
Thu Apr 15, 2004 8:10 am
Colchester, Essex
Stunned Monkey wrote:David Gentleman wrote: because the cams are chain driven and the pulleys fixed, its not like you can advance the cams manually to bring the exhaust valve in earlier as you could on say a Renault 5, or 21..
Errrrr..... yes you can. Been doing it a couple of months now, evening up the banks on the odd-fire (DeLorean & GTA Atmo) engines and re-timing them. Press the pin out of the sprocket. and you just have to put your faith in the torque of the retaining bolt - and trust me, it works.
Non Member
3474
Thu Apr 15, 2004 8:10 am
Colchester, Essex
Stunned Monkey wrote:
Twin turbos help with lag because of lower rotational inertia. However, tubular manifolds make lag WORSE, but allow for better top end power. Tight cast manifolds as found on most modern production (not performance) turbo cars work because of the turbulence generated in the manifold helps spool the turbo up. My HDi Xantia spools up at 1500rpm.
Quick spool time helps torque. Decent manifolds and large compressors help breathing and therefore power. When it comes to turbos, there really is no such thing as a free lunch. If you want torque, buy an Atmo, fit high lift cams and a free-flow exhaust.
Personally I think the Z7U has a lot more problems than just the turbo. It needs a larger downpipe, a larger throttle (even the DeLorean's K-Jet manifold has twin throttles that together are some 50% larger). The manfolds could do with being equal length and the cams are ridiculously mild... Oh and it's only got 12 valves
Martin
Users browsing this forum: No registered users and 122 guests