Mark@Abbey m/s

You can play with the cams as well as the fuel/ignition maps to try to get the best from the car after removing the cats. But we have never found or tuned a car that will have more torque low end without cats than with cats weather they are stock or high flow , but the new MD resonated cats do give the car a little more low end torque but make the motors DE/REV_UP give stonking mid range grunt. I will get a set on a car with headers fitted DE motor very soon , I think we will see lovely fat midrange torque curves and a few more BHP top end as well. These seem to pull the max bhp rpm down as well which is good.

Fitting fully de-cats will always give around 6/7 lb/ft and 6/7 bhp on top of a car tuned with UPREV with Stock cats. And sound great as well We have used the new Motordyne resonated de-cats , these give real good mid range torque and no lose at the lower end of the power band. I will post the price up on the Motordyne thread. Mark

I have a pair of those Scott, need to speak to you re some other parts for my UK car. Mark

I post up the gains tomorrow when I am at work, pulls always in 4th gear.

it,s on his 1st post above. lower numbers stock higher numbers tweaked! Yes , just added HKS filter and the remap. Mark ( sorry to hi-jack the thread but I cant sleep......to much super unleaded in my lungs)

HR cats are being developed as we speak , flange set up is different between the DE/REV-Up and the HR cars not a easy fix to make fit on both cars. Will have a price for the DE/REV-UP items tomorrow. Will have some data re these early next week. Mark

can you post a couple of pics please. Mark

We can use a larger MAF if needed. Mark

I do understand how both systems work , but if you have a stock or tuned map in your STOCK ecu the utec is still trying to tweak around them , I am not trying to knock down Thor at all , just that I understand how the stock system works and cant understand how a tuned stock ECU will cause any more problems than stock tuned ecu. You are not overlaying any multi maps in the UPrev you are tuning the ECU live, no piggy backs or anything. Not even seen Nurrish,s car so I am not tuning the car at all. Nurrish I here to help give me a ring if you need to.

I can return your ecu to stock , but I cant see how this will help.It will still have the same problem I feel. But I would need to be with the tuner to enter the correct figures in the feed back map while it is being tuned. So I cant do this with out a car or being @ the tuning shop. Mark

I could turn the CEL off with just the ECU being sent back , but to do the job properly, I would prefer to tweak the feed back map to the AFR,s that Pete wants to run , this will then stop the CEL coming on.

Had a think , Multi cylinder misfire is normally trigger by lambda,s reading a very rich mixture in the pre Cat lambda,s. I would say the car is reading the AFR at part throttle and then checking this agaisnt the closed loop map , if the figure is over a certain percentage out it will flag a CEL ( I would say your running very rich as it is F/I) , a misfire will show up as very rich as well , so I feel thats why your car is flag the CEL that you have quoted. Nurrish , I can tweak your Uprev tuned ECU to stop the CEL light coming up , but the multi cylinder misfire CEL normally puts the car onto the high det map , i.e ignition timing pulled. Mark

Cant understand that 2 people have had the same problem. lets get this straight ; All worldwide 350z use the same ECU plug, even the Revup uses the same plug as a DE car, just has a few extra wires for the extra cam control and the US has a few extra wires for a few things like fuel tank temp and the NATS wire is in a different position. The only difference between the early US and early JDM cars is that these cars have narrow band lambda,s fitted (the US and JDM cars went wide band 6 month 2005 I think would need to double check) all UK have wide bands fitted from build start. So only thing I can say is the Utec for a narrow band or wide band car? this could be causing the problems. Has anyone got a wiring diagram for a Utec that I can have a look at please? Mark

will tell you very soon,not cheap thou and will need to used with a XYZ Y pipe and race cats to stay legal

some on there way already..... Mark

MattG, all cars have closed loop and open loop maps , just the all the UK cars and from 6 month 2005 all other cars had wide bands fitted,this makes the car faster responding while on closed loop. closed loop map works with the open loop map , the open loop map has to be nearly spot with regards the correct fuelling otherwise the closed loop map has to work to hard to trim the fuel. Open loop is normally full throttle and over 5000rpm at part throttle. These engines dont have MAP sensors they have MAF sensors or air flow meters. We can supply a air flow meter to allow us to tune to approx 650bhp @ the flywheel. hope that is a little more easy to understand. Mark

HKS S/C kit has a horrible u bend in the air filter pipework , always something we have thought would cause a restriction. HKS ways seems to work thou , but your need to fit a smaller battery or move the battery into the boot. I just had a mail from HKS re the S/C used in this conversion , looks alot bigger than the normal HKS S/C unit thou , but It has got me thinking.....S/C or turbocharger......what will it be I wonder.....LOL

4 wheel alignment is £100-00 + vat (£117.50 inc vat) Mark

come and see us we will do it FOC. and your get a coffee while waiting.

No it doesn't , where did you read that , the car after deleting the self learn will run on the HIGH Det map i.e lower ignition numbers (SAFE) it will THEN add timing listening to the knock sensor suntil it is back to the LOW det figures (more agressive) We do not switch anything off in the ECU , just tune the learn figures to enable a SAFE map. I think we just refine the stock map.

Tricky, not being funny but modern ECU,s have moved on so much from say 8/10 years ago , look at our TV,s 10 years ago the TV,s was massive boxes , nowdays so much more compact better pictures, we could discuss merits off ECU,s for ever. I feel the latest spec ECU fitted to the Z are pretty awesome , we can tune ever ECU fitted to a VQ engine and even the new GTR can now be tuned. We can even add a boost control map to the 350Z ecu,s if we need to. The early narrow band ecu,s still closed loop very well as they are tuning around the lambda 1 settings which is okay, the later cars you can tune from 10.0 to 17.0 afr due to the wide band lambda which are fitted. Mark

far more superior than an old Supra ECU I feel. From 06/2006 all 350 z have wide band ecu,s , but all 350z has the ability to tune the ignition timing live. Mark

just a quick reply to a few questions; We call the 350z a self learn ecu ; it works it 2 ways 1 IGNITION; the car runs 2 maps , low det and high det maps , the high dett map uses a less advanced (agressive) map. When you delete the self learn ,the car reverts to the high det map then starts feeding timing in ,listening to the det sensors to listen for the dreaded tingle. after a short time the car will be running full timing , they can even add a degree or two here and there we have found most on part throttle. 2 FUEL again the car runs 2 maps 1, closed loop this is called the trim map , the car uses the lambda reading to run the car at the correct fuelling 2,open loop i.e full throttle and there about , the numbers in the map will add the correct amount fuel you want i.e no closed loop. You can if needed delete the closed loop , only normalyed used on race cars but we find using this map and a tuned figure helps part throttle driving especially with turbo powered car. when we say self learn we mean the car can play with the fuelling and ignition maps itself to obtain the best/safest performance. Very smart ecu just like 350 owners Mark

not the dyno causing problems it understanding how the car works , these car self learn, any difference in driving issues they start to self learnagain , delete the self learn while on the dyno it will take 5/6 runs for the car to get back the where it was.. I dig a dyno sheet out showing this sometime. Mark

UK cars dont ever seem to run the quoted BHPNissan say we find but these cars need to run a certain way on the dyno to give a good reliable figure. You need to run in 4th gear , do 4 or 5 full throttle runs you notice the bhp will increase a sthe runs count up , then let the car cool off for 2/3 mintues then carry out a full throttle run , this will give the most reliable figure we find. We normally see around 230/235 bhp at the hubs for a stock DE UK car this equates to around 265/270 bhp at the flywheel , I have run a few so happy to quote hub bhp , but you can't compare figured between dyno,s thou. any more questions ask away. Mark