Mark@Abbey m/s

Yes I did know about the revisied pistons, but dont know if that is a good thing as the 296bhp cars tend to use more oil than the early 276bhp cars. 296bhp ecu cant cope with 2 AFM,s and 2 x TB,s. Havent looked into if the 313bhp ecu will fit in a 296bhp car thou , to be honest to much hassle , sure we can sort it using the whats the cars has fitted just dot the i abd cross the T,s as to speak. Bottom end of the HR motor is far superior to the early engines thou , takes more rev,s.

I think Nissan may tuned the car to make a lower but wider spread of torque but a bigger push top end, this makes a RWD car easier to drive in my eyes. Torque is what makes a car tail happy.Just like Chris has said above. I will look into cams spec,s later on between the 2 cars , the cylinder head sare the same thou bar the extra cam postion sensor dont know about compression thou , also lower collector is different as most prople already know. We may well come up against a wall with finding torque without major engine work, but I do know the car will make a better smoother spread of torque , better throttle response. The fuelling as a std car needs a lot of work. again thanks for the replies.

thanks for that boys , it answer,s the question I had , the Revup motor although it gives a good blast top end over the 276bhp car the mid range torque is in kind words "pants" against a 276bhp car in std or tuned spec. We have a 296bhp car on the dyno at the moment , mild mods Y pipe and exhaust system ( got 5/16 spacer to fit and a pop charger as well), but the mid range torque is down from even a STD 276bhp car , we can pack it out with some mapping but it wont give the figures like a 276bhp car does. ( I will post some comparision dyno sheets soon thou ) tweaking the inlet cam map doesnt help at all with torque so there must be something else holding the car back which leads me onto; So I have been reading up about the MREV2 so I think I will be trying that sometimes very soon , maybe on MrSteve,s race car as the 1st thing he said to me I want more mid range torque. I have a few idea,s that "may" help mostly in the induction of the 296bhp car. I will be back with some more info after a few hours more on the dyno today. GT4 Zed , where are you based in the UK? thanks again boys

Yes I was speaking to Colin at Brands on Saturday, hopefully he will reply.

Any of the chaps and girls on here had both above cars , can they give me some feedback with regards how the cars drove i.e midrange TORQUE top end BHP,which car was stronger in what area, just trying to work something out.

is the car from the bournemouth area? chap used to have a red 34GTR as well?

sounds likes O2 sensor problem , you need to find out of the correct O2 sensor are fitted to the car. Mark

Mark, list the stuff up , I might be interested in a few tools. What clothing you got as well? Mark

As long as the UK O2 sensors fitted to the JDM motor and maybe the water temp/oil temp sensors are also swapped over I cant see a problem running a UK ECU on a JDM motor. The UK motor will use wide band O2 sensors where are the jap spec cars only use narrow band sensors, both o2 sensors do have diff plugs thou I think. Maybe better to take it to a Nissan dealer and get the fault codes read and then post them up on here. Never heard of a fuel pressure temp light thou!

Nissan can tell if they want anything that has been done to the ECU , even if it has a Haltech connected then removed. I dont think your have any trouble afetr refashing the ECU , not as if we are going to let your car rev to 10,000rpm. We just finsh the job off for Nissan as to speak.

or you could just have the STD ecu remapped. have a look at this thread. viewtopic.php?f=114&t=27916 £345-00 inc vat.

Your correct when you reset the ECU the car will feel a little sharper, then as time goes by the ECU will retune it self back to the settings stored in the ECU. Strange I know but this is how most modern car was nowdays. When you dyno the cars after a reset it takes a few runs to get a consistent figure.

Early car 276bhp base map ready to go now Attached are the dyno plots Red is the car as supplied STD Purple is after tuning with the UPREV system. BHP gain of 3/4 bhp thoughout the rev range , smoothed the bhp over 5000rpm no real gain in BHP top end , the base car was a good car gave 250 hub BHP. Torque again 4/5 lb/ft entire rev range more around 5000 to 6000 rpm As well as tuning the Fuel/Ignition/Cams maps we retune the throttle map to allow full throttle at all rpms and raise the speed limiter to 180mph and raise the rev limit by 100rpm. 2ND set of dyno plots are same car fitted with JWT popcharger , better gains top end and even more wider spread of torque. £345-00 inc vat now includes 1 hour dyno time to trim the map to your car. Remember our dyno reads at the hubs, the BHP is measured at the hubs , Torque is again measured at the hubs and then divided by final drive ratio to give a flywheel figure.

I presume you thinking like a turbo car wind the boost a little and gain a big chunk of torque and BHP , with regards gains like this on a N/A to be 100% honest you aren,t going to get them. Nissan have turned out a engine that is pretty spot on. With the Uprev system we can tryt o grab a few lb/ft and bhp here and there on a STD motor , the motor will give a bigger gain with the extra modifications like exhaust headers, high flow cats , exhaust system maybe a manifold spacer. Dont think it unlock a huge amount of ponies but it will definitely gain a good spread of torque and drivability, I think we will have some dyno plots very soon with a car with these mods you have spoken about. But to get the bigger gains I think if you want to stay N/A , you have to make the engine able to take higher rpm , this will involve fitting cams and valve springs to enable to motor to run over 7000+rpm. From what we have found with running the VQ35 in F/I , the cylinder heads will flow big bhp amount of air. So we just need to be able to get the air into the motor. Next step in the Uprev development is to have a 350Z on the dyno with the next step of mods. Maybe like this- Exhaust system , Y pipe , air filter kit (plenum spacer) I will remove this at 1st thou as I feel that most people will have an exhaust and filter fitted at 1st.

I also have a Injen filter kit to try , this I have heard gives the best increase in torque , this maybe due to the increase in inlet pipe length. It was a JWT popcharger , customer supplied it , so dont know the model I am afraid. But the STD air filter still works very well. Still got so much development to do thou No re the speed limiter , need to get my car back on the dyno this week to do some more datalogging.Will let you know when I have cracked the problem.

The figures are corrected in the 2nd plot , on the left it has flywheel torque on the right AFR. We can put flywheel torque up with Flywheel power but this isnt correct as the dyno doesnt read flywheel BHP.

You need to re read the start of the dyno plots posts, our dyno reads BHP and torque at the hubs. You get a big figure of torque at the hubs due to the multiplication of the gearbox and final drive ratio,s. On the 2nd dynoplot you get flywheel figure for the engine torque and AFR (air fuel ratio) I have zoomed in to make it easier to see the gains , I can,t show the whole graph then I am afraid. If I have confused anyone I am sorry for that. Mark

Boys , is this any good for you. 2nd set of dyno plots. RED again STD car BLUE car fitted with POP charger and tuned with Uprev. Same conditions as 1st set of plots gained a fair amount of torque through the entire rev range and gained BHP top end and smoothed the power out. With the popcharger fitted we gained 7 bhp top end from the uprev+ popcharger and 7/8 lb/ft of torque max mostly around the 5000 + rpm range. We have scrolled in to make the gains more easily to be seen. The Dynapack autoplots the graph axis,s , thats why the graph uses the whole page I can if you want add a set of graph axis,s like a Dyno dynamics this will smooth the graph thou , but it can make the graph enhance the figures. I can also scan and link up the hard figures if you want to view these for you information.Even use these to configure your own graphs. Mark

Yes but look at the area under the graph , thats the gain, we arent just gaining torque and bhp for a very small rev range it is increased right through the rev range. As the car is a N/A car we arent going to gain 30/40 bhp and torque we can just nibble at the maps to smooth the curves gian a few bhp or lb/ft here and there. I havent done a car yet that someone hasnt been pleased with.

Same car again , fitted with Nismo filters kit and HKS Y pipe. GREEN STD car BLUE Nismo filters,HKS Y pipe and Uprev Gained torque from 3000 rpm to red line approx 10lb/ft , car came alive between 3 and 5000rpm. Gained 6/8 bhp thoughout entire rev range again right up to red line

Some more dyno plots , cheers for letting me use them Andy Mc. 08 car with the HR motor fitted GREEN plot STD car, RED plot STD car with Uprev Again on the same day ,tweaked fuel/ignition/cam maps, tweaked throttle map for response , raised speed limiter and rev limits. All runs under same conditions on Dynapack dyno. Inlet temp around 23 degres C. Seems this motor like running rich tried to lean it off lost BHP and TORQUE. gained around 4/5 bhp through out rev range. And 4/5 lb/ft of torque through out rev range.

Chris, re scaned the pictures.....put a not on each thread re figures, I feel everyone looks at the headline figure to much , As I have said area under the graph is what counts. Everything was done under controlled definitions , inlet charge temp within 2 degress C ,ambient within 2 degress , run length the same , same gear. hope this helps everyone.

Yes got the file to tune the GT4 car , I havent mapped one of these yet, but I think we already have a car booked in very soon.

Re the number do you mean max numbers which I feel are pretty pointless with tuning it always the area under the graph that I look at. The map for the STD car re the map for the Popcharger there is a fair amount of difference. I feel the Popcharger shortens the inlet length so losing low end torque but gained top end BHP. Re the person that had it done I think they will be okay.If not I will rescan them.

2nd set of dyno plots. RED again STD car BLUE car fitted with POP charger and tuned with Uprev. Same conditions as 1st set of plots gained a fair amount of torque through the entire rev range and gained BHP top end and smoothed the power out. With the popcharger fitted we gained 7 bhp top end from the uprev+ popcharger and 7/8 lb/ft of torque max mostly around the 5000 + rpm range.