few problems when mapping

matt walters

matt walters

Member +
Hi guys

im experiencing problems now my car is being mapped. here's a quick spec

forged 5e with heavily ported and polished head, angle cut valves, titanium retainers

vf35 turbo on a wepr evolution td04 kit.
Race inlet

Problems im having are:

When the car is booted on the rollers the water temp goes up by 7ish degrees. But obviously continued booting it gets really warm.

Also it seems to be making really shit power for the set up, at .6 bar it was 175whp and at a bar its 200whp.

think Ted on here had a very similar set up and was at 325bhp at 1.5 bar.

Really disappointing for all the money I've spent on it.

Also the mapper has told me that the turbo makes good power at low revs. then flattens out the pulls really hard at the top of the rev range.

Anyone had similar issues?

Whole lot was put together with the intention of braking into 300brake and its pissing me right off that a spec like this should do but isn't.

And feedback welcome as always rep :)

Thanks Matt

forgot to say its mapped on emu
 
goldenvtr

goldenvtr

Member +
whats your ingnition map like? ive not had mine rolling roaded but im forged 5e td05 16g at 18psi 22psi and 26psi (cant run 26 due to crappy stock ignition system failing lol)

but im timed up on 5e marks completly stock head and 7.5.1 comp ratio, i do have no idea on my power but its a damn site faster than i was when i had 280bhp on my old vf28 turbo at 1.2bar.

maybe your mapper needs to add some timming?
 
Texx

Texx

Super Moderator
goldenvtr said:
maybe your mapper needs to add some timming?
Click to expand...

That was my first thought also.

Are you using an EGT gauge?

What's the AFR like after hitting peak boost?


Do you have a dyno graph for the previous 2 runs? What is the torque curve like, where does it build, peak and start to drop off?
 
goldenvtr

goldenvtr

Member +
matt walters said:
Will find out the above tomorrow morning and post back.

Its a stock ignition system and its timed to 4e
Click to expand...

the ignition timming with be controled via the emanage mate.

also i recommend the 5e cam timming marks, ive always had mine on this, logically, using the 4e marks doesnt make sense to me but others will argue that.

do you have a copy of your emanage map saved? im intrested to see how it looks if you want to email it me
 
matt walters

matt walters

Member +
Haven't got the car back yet mate but im sure i can ask tomorrow for him to e mail me some copies of the dyno sheets and the map.

Thanks for your help guys
 
Chris@CCM

Chris@CCM

Member +
Time it to the 5e marks on both the belt and cam (remove the pully and set it to the 5e hole in the pully ) see we're u r from there
 
G

gorganl2000

Lifer
strangely...i've looked at the 5e vs 4e tming mark with respect to the cam timing....its a very few degrees between the two marks at best....this same thing could be achieved with an adjustable cam gear

i always figured if someone is using a programmable ecu to tune a car, they have complete control over the ignition table and can add/retard timing as necessary.....hence the effect of 4e vs 5e cam timing may become somewhat less important

any thoughts on this chris, goldenvtr or any other members?

to me the figures look good...as you are only running 1bar and your figures are in whp
bhp readings tend to vary depedning on the factor used to reach them

when you turn up the boost i'm sure you will reach closer to your target

lots of members have gotten close/over 300 "bhp" using the vf35/34 at approximately 1.5 bar....ted, pc18, etc

the vf series seems to give a wider/smoother power band and hence you may feel its not as "punchy" as other similar sized turbos
but more/wider power under the curve is always a good thing
 
G

GP82

Member +
gorganl2000 said:
i always figured if someone is using a programmable ecu to tune a car, they have complete control over the ignition table and can add/retard timing as necessary.....hence the effect of 4e vs 5e cam timing may become somewhat less important
Click to expand...

The 4E and 5E engine timing marks is the duration of cam lobe or valve timing relative to piston position on the crankshaft. The timing table in the ecu is for spark timing.
 
G

gorganl2000

Lifer
laggy? what rpm do you reach full boost? a vf35 on a 5e should not be laggy
what's your compression ratio?
and what kind of inlet manifold do you have exactly?
 
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