Thought I'd have a bit of an investigation into the limits of the stock turbo & fueling system in my TT Auto:

 

Result:

 

The map is just a work in progress I created recently. Max duty on the stock 370cc injectors at stock fuel pressure was 94% at the highlighted point with a nice 'safe' AFR of 11.89:1. 1.4 bar was the maximum boost pressure in the mid range, as RPM increases the tubbies cannot produce anywhere near this boost (yes, I know they are being pushed to the ragged edge). Still running stock elbows, downpipes, cats & SMICs. I personally don't mind running injectors at 90%+ duty, I have done it for years on various vehicles, but lower obviously means less heat. Honda run their injectors at 100% in WOT conditions, apparently.

 

I normally run my own cars leaner at 12.2:1 which would give some more headroom with regards to duty and a few more BHP. I have read a lot of reports with people stating stock injectors max out at 14/15/16/17 psi, but they don't. Leaning out under boost with stock turbos at anything less than circa 1.5 bar (bear in mind the turbos will not be producing this at high revs) is due to the OEM ECU programming, not maxing out the injectors IMO.

Edited October 14, 201213 yr by Noz

Finally got chance to do a bit of tweaking on the dyno:

 

394.4 bhp & 410.2 lbft (fly)

342.9 whp & 372.9 lbft (wheels)

 

Stock engine, Auto turbos, stock intercoolers, stock exhaust system inc. cats with aftermarket backboxes, stock 370cc injectors at stock fuel pressure. Just air filters, one of my boost controllers, back boxes and mapping voodoo :ninja:

 

Still got more to go. Not bad for a chip, eh?

Edited October 26, 201213 yr by Noz

well come on then put of the dyno plot ..

 

 

where was it done at ?

Sounds good Noz, you should start mapping others cars like mine once it's built n run in lol

Sounds good Noz, you should start mapping others cars like mine once it's built n run in lol

 

Mate, I thought you knew I mapped cars, been using NIStune for years and before real-time mapping became available, it was chip burning & emulators (2005) with the S13 & Cossies. A good percentage of old school Nissans will be running one of my chips at the very least! I've just never advertised the fact as I only ever used the road which is sketchy at best, so recently been using Santa Pod. Full dyno set-up as well now though, so all bases covered :cool3:

Yea new you did it its just when I asked when you were round mine you didn't seem keen lol, how much would you charge to map mine once it's done drop me a pm if you want

 

Had a couple of your chips on my s13's always ran really good, should of got you to map my s13 that was 380hp it has a dastek unichip n ended up melting a few rings

Edited October 26, 201213 yr by 111mattin111

well come on then put of the dyno plot ..

 

 

where was it done at ?

 

Haha, impatient!

 

 

Dynocom dyno.

Yea new you did it its just when I asked when you were round mine you didn't seem keen lol, how much would you charge to map mine once it's done drop me a pm if you want

 

Had a couple of your chips on my s13's always ran really good, should of got you to map my s13 that was 380hp it has a dastek unichip n ended up melting a few rings

 

Didn't seem keen? Mate, I love mapping cars, I live & breathe it lol. Was that the day I was enroute to a wedding 170 miles away after 3hrs sleep? Hectic times!

 

Good old S13s: 383bhp & 326lbft @ the hubs, standard 1.8L engine, still going strong as far as I'm aware. Sheesh, that's more power than this 3L V6 TT. Guess I'm going to have to pull the engine and fit twin HX30s....

No was the first time you popped round when you stopped n had a chat, well if your up for it you can map mine,

 

The s13 was broke for parts in the end after it melted the piston rings and a piston

We had a customer once who was running 21psi in a daily driver, bog standard engine, we checked all we could get to and nothing looked or appeared to be upgraded, the car went like a super missile and had no sign of detonation and seemed to lap up the boost No problem, I drove that particular car several times and could not work out how it was running how it did.

 

Later the owner had a small problem and posted up on here how it was running and was blasted for been incorrect and no one believed him, but we had seen it and it was real, a garage owner in Cyprus also came on here years ago and said how they had 500bhp out of a totally standard engine and no one trusted what he said, later on a trip to Cyprus I saw how it was done and its very possible.Jeff TT

What you say jeff. got new tubs new large super large air filter and large fmic.what else do i need before you begin?

whats with the 4200rpm drop in power ?

and why is it only showing the graph from 3k

We had a customer once who was running 21psi in a daily driver, bog standard engine, we checked all we could get to and nothing looked or appeared to be upgraded, the car went like a super missile and had no sign of detonation and seemed to lap up the boost No problem, I drove that particular car several times and could not work out how it was running how it did.

 

Later the owner had a small problem and posted up on here how it was running and was blasted for been incorrect and no one believed him, but we had seen it and it was real, a garage owner in Cyprus also came on here years ago and said how they had 500bhp out of a totally standard engine and no one trusted what he said, later on a trip to Cyprus I saw how it was done and its very possible.

 

Jeff TT

 

 

 

A very good example of 'actual' fact blowing 'hearsay' fact out of the water I think!

whats with the 4200rpm drop in power ?

and why is it only showing the graph from 3k

 

Kickdown to 3rd (1:1). When an automatic is on a dyno and there is no way of locking the box into a specified gear, you start it at 3k RPM as it helps to force kickdown to 3rd.

 

Didn't have time to disconnect the kickdown switch, and have not looked into if this is feasible (but can't think why it wouldn't be).

 

Results in line with a 110mph 1/4 terminal with a lardy 300zx.

A very good example of 'actual' fact blowing 'hearsay' fact out of the water I think!

 

Only actual fact & empirical data in this thread! :D

Kickdown to 3rd (1:1). When an automatic is on a dyno and there is no way of locking the box into a specified gear, you start it at 3k RPM as it helps to force kickdown to 3rd.

 

Didn't have time to disconnect the kickdown switch, and have not looked into if this is feasible (but can't think why it wouldn't be).

 

Results in line with a 110mph 1/4 terminal with a lardy 300zx.

 

that would explain the dip to .... didnt know it was Auto m8 ...

 

50hp is quit a big transmission loss but suppose thats cuz its auto

Only actual fact & empirical data in this thread!

 

Rare for this forum.........:whistling:.

but good to see.:thumbup:

I've just had a good read back through this and I'm intreagued

 

Out of interest (call it an experiment if you like) starting with a stock engine and turbos

 

with addition of:

 

- AEM EMS

- 3.5 bar MAP sensor

- 740cc injectors

- twin HKS filters

- Straight through de-cat

- 3 row fmic

 

and assuming all the cooling mods are in place to keep things nice and cool

 

what would you hope to see (I don't necessarily mean power figures etc but more so the driven characteristics of the car...responsiveness out of corners, acceleration on straights)

 

I'm assuming it would be advisable to upgrade to a Bosch 044, adjustable FPR and pair of AFR (one per bank or on switch)

 

and haven't looked at costs for custom mapping so what would be a realistic budget for the above setup? (parts and fitting aside)

With the 740s you've got all the headroom you'll ever need with stock turbos. The amount of air they can flow will never require an upgraded fuel pump, FPR or dual intake, but there is of course nothing wrong with fitting these items.

 

With regards to drivability of the theoretical set up, that's a difficult one to answer as it's so subjective and dependent heavily on the maping side of things and boost control. With the turbos as the limiting fator, you would still have a very responsive powerful car.

 

I'm fitting a FMIC and dual short intakes this Friday on my own Zed and will get it on the dyno to see the difference and how much airflow has changed. It won't be a dual-MAF set up, but it doesn't need to be. If I get chance I'll replace the stock exhaust & cats with free flowing items and see how much the stock Auto turbos are really capapble of, power-wise. I will be fitting an adjustable FPR at this point to get more out of the stock injectors. I would expect to add 20-30 bhp & 10-20 lbft.

 

For an idea of mapping costs take a look HERE and drop me a PM :)