View Full Version : Are there any faster Zlets out there ??
I was very happy with my figure last week but my mate was having boost problems on his Mk4 GSI running Regal Phase 3.
Talked him into going for Cossie 4x4 -34 actuator (see my old thread for my fitting) as it showed good results on my Coupe and he decided to bite the bullet and also fit the VXR MAF at the same time.
Got it back on the rollers at Regal today for a check over and new figure. After only one run they started to take the car off of the rollers so we thought there was a problem.
Chris come through and said that is fine good figure.
We both look at the graph to see
296.8bhp with 367.6lbft of torque :eek:
Now he wants to know were he can find 3.4bhp lol
Got to get my bum in gear and replace my O2 sensor and MAF which are dead and play catch up lol.
On a good note my Apexi Filter arrived today so I just have to get a date with Courtenay now to adjust the map :)
Impressive torque figures 8)
it is quite smooth, mine has more of a punch but I do run more overboost.
I was always lead to beleave that the high torque spike to start with gave you your peak torque figure. But Justin only OB 20/21 but still made good figures
Does he want to buy a cam for the extra bhp ;)
He says he keeps looking at cams, I told him not to bother
what was his figures before the vxr amm and the cossie actuator?
Do you really need to change ur map because you have changed the air filter?
purple pride
22-02-2007, 23:38
neil, how much did the cossie actuator cost? was it the standard sierra actuator, or an aftermarket one? did you need anything else to fit it?
He was getting 270bhp before the the boost was dropping right down to 13psi.
When I say adjust the map I mean to take the VXR AFM sorry
It is just an uprated saffy cossie 4x4 one. If you hunt for my old thread it even has pics. Oh and it only cost £65 :D
purple pride
22-02-2007, 23:51
great, thanks for the info. my act is losing boost!
your current actuator may just need a tweak, worth looking
theblueraven
23-02-2007, 01:46
is this about how fast it is or how much power it has?
seen plenty of cars with more power than me run much, much crappier 1/4 mile and track times.
Scottyboy
23-02-2007, 04:03
Very impressive figures - 8)
There are a number of cars now breaking the 300 bhp barrier!
is this about how fast it is or how much power it has?
seen plenty of cars with more power than me run much, much crappier 1/4 mile and track times.
problem is they are still front wheel drive and laws of physics say no lol.
LSD is the way forward now :D
Very impressive figures - 8)
There are a number of cars now breaking the 300 bhp barrier!
yours wont count Scotty as you cheated with the LEH lol :) ;)
theblueraven
23-02-2007, 09:15
problem is they are still front wheel drive and laws of physics say no lol.
LSD is the way forward now :D
Yep, Got one :D
Cheers - my pc at home is broke so NeilC is going to put my RR Graph up sometime 2nite for me.
He was getting 270bhp before the the boost was dropping right down to 13psi.
your current actuator may just need a tweak, worth looking
just tweeked my vxr one a couple of turns and the boost guage now shows its holding what it should do
Wont last for ever as they do wear out but at least it saves you some pennies for a bit longer :)
Cheers - my pc at home is broke so NeilC is going to put my RR Graph up sometime 2nite for me.
as requested :)
http://img.photobucket.com/albums/v427/neilvx/justinsremap2960x1280.jpg
purple pride
23-02-2007, 19:35
just wondered, you use the -34 actuator- what strength is the vxr actuator?
the -34 opens at 14.5 psi but not sure about the VXR at a guess I recon 6 - 8psi. cant be much if the exhaust gasses can force there way back in on full boost.
jamesmurray
23-02-2007, 20:52
how can a z20let make nearly 370lb/ft when its not even boosting to 1.2bar(17odd psi) and holds 0.8bar? surely youl need serious overboost for that high torque level?
jimbo
Thats what I was always lead to beleave ??
Courtenay low torque map (OB 21psi) - High Torque map (OB 24psi)
LordNikon
23-02-2007, 21:04
BHP is not all about boost you know ! lol
LordNikon
23-02-2007, 21:05
Is this the one from the other weekend that you wanted the actuator welded ??
yep but they found some bolts for us :)
I was always thought that overboost gave you your peak torque and held boost gave the bhp figure ??
LordNikon
23-02-2007, 21:08
Ahh ok - i am the guy who was helping Chris with the Rollers. Nice figures after all that ;)
yep well worth the mucking about
My new O2 goes on tomorrow and the MAF gets upgraded on the 23rd of March so hope to get a little more out of mine and play catch up lol.
jamesmurray
23-02-2007, 21:18
who said anything about bhp? im talking about torque. because these turbos cant flow large volumes of air they need to use a high boost pressure to deliver the goods. and to me 370lb/ft doesnt eqaute with those low boost levels, even taking into account optimisation of ingition and fuelling maps.
I cant explain it ??
I hit 1.4bar (more on the road) and got 340lbft.
Thats why I am so confussed now lol
jamesmurray
23-02-2007, 21:23
its got me stumped as well....
jimbo
I had 385ft-lbs with little bit higher boost but with lowered CR...
but when I look at graph with this figures it makes me sick.
It's not a problem to generate torque in s turbo car, the problem is to hold it!
the question is..where do You have a peak torque value and what is an avarage amount of torque vs. rpm?
Post Your dyno graph...
do you have a copy of the graph ??
yeah, sure...but I won't post it here because it wasn't the final version, it had only 303 WHP with big torque at 4krpm because of to high OB.
and almost 500nm is really lot for a fwd w/o lsd :(
My OB peaks 4379rpm but my O2 sensor and MAF have both died so fueling isnt spot on at the moment :(
if Your MAF and (first)O2 sensor is dead I wish You luck while driving...
do You have EGT mounted ? what are the measures ?
what was the AFR while mapping and who the hell let You go with peakpower at 4.6krpm and peak torque at 4.4kpm ? that indicates there's something not going nice..
The new figure came to light at a local rolling road day. A new O2 is going on today and a new VXR MAF is going in on the 23rd March.
Justins 368lbft peaks at 3981rpm
I think we are peaking a little later due to the strong Garrett actuators we are using
with high mods and big turbo it's usual to have torque peak @ about 4krpm
but when Your power peak is so close to torque peak and gets max @about 4.6krpm !!? You must be running small turbo with high boost, it's efficiency goes down after 4.5krpm....it's to small for desired power.
Or maybe other parts are not suitable for what You have now.
To go with z20let for stable-high-torque from 3.5-4krpm You need to do headwork and change cams. You won't be able to get torque at high rpms with stock cams.
I'd really like to see Your dynograph....I have a feeling it's a big crap. How long(rpms) do You have that ennormous torque ? 200-300rpms ?
jamesmurray
24-02-2007, 10:42
yeah to get higher power figures the torque needs to be held for longer rpms, so pushing past 300bhp barrier requires the torque to be held for longer. at the moment these engines run like diesels with these small turbos! just image the power that could be had if the torque curve kept pretty level for another 1500rpm or so. twin scroll turbos anyone? lol
jimbo
with high mods and big turbo it's usual to have torque peak @ about 4krpm
but when Your power peak is so close to torque peak and gets max @about 4.6krpm !!? You must be running small turbo with high boost, it's efficiency goes down after 4.5krpm....it's to small for desired power.
Or maybe other parts are not suitable for what You have now.
To go with z20let for stable-high-torque from 3.5-4krpm You need to do headwork and change cams. You won't be able to get torque at high rpms with stock cams.
I'd really like to see Your dynograph....I have a feeling it's a big crap. How long(rpms) do You have that ennormous torque ? 200-300rpms ?
heres mine
http://img.photobucket.com/albums/v427/neilvx/Regalpowergraph1280x960.jpg
you can see it was still holding top 280s at 6000rpm and wasnt that bad at 7000rpm with 260+
Scottyboy
24-02-2007, 11:02
with high mods and big turbo it's usual to have torque peak @ about 4krpm
but when Your power peak is so close to torque peak and gets max @about 4.6krpm !!? You must be running small turbo with high boost, it's efficiency goes down after 4.5krpm....it's to small for desired power.
Or maybe other parts are not suitable for what You have now.
To go with z20let for stable-high-torque from 3.5-4krpm You need to do headwork and change cams. You won't be able to get torque at high rpms with stock cams.
I'd really like to see Your dynograph....I have a feeling it's a big crap. How long(rpms) do You have that ennormous torque ? 200-300rpms ?
What head work did you have done Coube? and what cams are you using? was this work done by Stephan as well? - just asking as Klasen are involved in the build of my car at the moment.
Sorry for going a bit off-topic guys.
jamesmurray
24-02-2007, 11:04
you going for a new manifold/turbo setup or a super hybrid K04/26/29 creation scott?
jimbo
Scottyboy
24-02-2007, 11:22
you going for a new manifold/turbo setup or a super hybrid K04/26/29 creation scott?
jimbo
It won't be a K04 hybrid. Sorry not being obtuse - just can't discuss it at the moment.
The time is coming where I can though very soon!
mattcoupturbo
24-02-2007, 12:17
Hmm interesting read that. Looking forward to hearing what setup your having scotty.
heres mine
http://img.photobucket.com/albums/v427/neilvx/Regalpowergraph1280x960.jpg
you can see it was still holding top 280s at 6000rpm and wasnt that bad at 7000rpm with 260+
before You've posted it I made a calculations in Excel, the graphs look quite similar :(
If anyone would do such mapping for my car, the only thing he could watch would be my ass.
For me that's ****ed up job :(
but that graph is with the dead O2 and MAF so fueling is all over the place. It is expected
mattcoupturbo
24-02-2007, 12:44
before You've posted it I made a calculations in Excel, the graphs look quite similar :(
If anyone would do such mapping for my car, the only thing he could watch would be my ass.
For me that's ****ed up job :(
:lol: quality post. Like neil said it was with messed up sensors. Surprised they didn't abort the run if both of those sensors are playing up, do Regal monitor AFR whilst doing RR runs on their cars?
aberdeenGSI
24-02-2007, 17:35
What head work did you have done Coube? and what cams are you using? was this work done by Stephan as well? - just asking as Klasen are involved in the build of my car at the moment.
Sorry for going a bit off-topic guys.
Same with my car aswell, my head has already been done ready for the next stage :cheesy:
what did you do to your head ??
aberdeenGSI
24-02-2007, 18:05
the fully monty got done to it, eg ported and polished,new valve seats..Neil are u booked in at courtenay on the 29th march? if so i will see u there.
:lol: quality post. Like neil said it was with messed up sensors. Surprised they didn't abort the run if both of those sensors are playing up, do Regal monitor AFR whilst doing RR runs on their cars?
don't know what You're talking about.. :roll: with that "quality"....
I think, someone who tunes and dynotests car with dead MAF and Lambda has really empty head :(
I'm curious what was the AFR reading while dynotesting because maf/lambda are two major sensors to controll this value.
Did they check EGT ?
IT WAS A ROLLING ROAD DAY SO CARS WERE IN AND OUT NO AFR WAS TAKEN.
O2 was replaced today and Courtenay get the car in 3 weeks to re fine turn it.
That O2 fault has been there since I have had the car and I thought it was to do with the precat, AFR was fine when it went upto CS4 and the MAFs die all the time, that one was my third.
You cant go on bitching about my map until you post yours up for nit picking.
We found the faults, car still drives fine and I am fixing them ASAP what more can I do, stop going on like I did it on purpose.
Scottyboy
24-02-2007, 20:27
the fully monty got done to it, eg ported and polished,new valve seats..Neil are u booked in at courtenay on the 29th march? if so i will see u there.
I know what you are up to mate.......:wink:
Scottyboy
24-02-2007, 20:31
OK - points made all round - give the guy a break, he is Polish and might not quite understand English as much as we do - and he does have a 350bhp ZLET.
Closed as thread is no longer useful.