Running TDo4 and TDo5 turbos, how much lag?

[scottydouk]

Just wondering with a nicely set up 1300 Starlet Gt, what sort of turbo lag you get with the TDo4 and TDo5 turbos?
Ie, what sort of rpm do they spool up 1 bar boost?
All help appreciated

 

[Dan_112]

My td04 comes in around a 3400 with a bar of boost. most people go for a td04 on the 4e as the td05 comes in later so I've heard (havnt tried a td05 though)

 

[ramses974]

Just wondering with a nicely set up 1300 Starlet Gt, what sort of turbo lag you get with the TDo4 and TDo5 turbos?
Ie, what sort of rpm do they spool up 1 bar boost?
All help appreciated

There is a big difference between td04 & td05
The most common td04 are 'L' series ,& the common td05 are 'H' series...
As you know in mitsubishi series turbo the L spools better than the HL and than the H...
For going to td05, you must uprgage your head, have a good mapper,etc meanwhile it will be better it always be laggy than a td04 but lag will be reduced

 

[HYBRID]

my greddy td05h gives me 30psi by 4800rpm

kon

 

[ramses974]

my greddy td05h gives me 30psi by 4800rpm

kon

That is a good job ...

 

[Guye]

my greddy td05h gives me 30psi by 4800rpm

kon

That's excellent Kon!

One thing to keep in mind is, generally speaking, the higher the final boost level, the longer the wastegate has to be kept shut to speed up the turbine, the more responsive spool up becomes. At lower boost levels, the only real exception to this is if you are using an electronic boost controller with gain settings allowing you to force the wastegate to stay closed right up to the desired boost level. Boost come in almost like a spike (as if there is no wastegate) but levels out, stabilizes and holds at your desired boost as the controller finally opens the wastegate at the last moment. Manual controllers allow the wastegate to fully open progressively (earlier) as the desired boost level approaches. Some response is lost with this type of controller as the boost comes in progressively as well. If the quickest spoolup possible is your aim, (ignoring head work, engine displacement, compression ratio, timing tuning, exhaust and intake manifold design etc.) it may be worthwhile installing a good ebc, or taking the time to dial in the gain settings if you have one installed already. Many don't seem to realize that these units offer benefits beyond simply raising boost pressure.

Just thought it was worth mentioning if spoolup is being investigated...

 

[steve-gers]

I have a greddy profec b spec 2 and put up a thread a while ago to try and figure out how to work it. Looking at that thread and my ebc settings would you say I could up the gain or set gain to create more turbo response?

 

[ryan-11]

it also depends on the size and make of td04/05

 

[wastegate]

Most of td05h-16g has 1 bar@4500rpm and they are journal bearing.

 

[Guye]

I have a greddy profec b spec 2 and put up a thread a while ago to try and figure out how to work it. Looking at that thread and my ebc settings would you say I could up the gain or set gain to create more turbo response?

Yes you can. On the profec B spec 2 it's a long process as you have to adjust the gain and set gain incrementally, drive on boost to test, then readjust. The aim is to get your boost to spike rapidly to the desired level (15psi for example) but hold that boost steady until redline without creep or fall off. If the gain setting is too high in relation to the set gain %, it may cause unstable boost at high rpm. It's purely trial and error and patience. As you raise the gain setting incrementally (by 2), you may have to lower or raise the set gain % based on the boost holding after you've achieved optimum spool up response. If stabilizing the boost is difficult, lower the set gain incrementally until it improves. It's different for every car/turbo.

 

[Guye]

It' also worth mentioning before adjusting and testing these settings be sure to have your boost warning set for at the most 1 psi higher than your max desired boost and set the unit to default back to 99% (wastegate spring pressure). This way if you're causing excessive spiking due to an overly aggressive gain setting the controller will prevent damaging from overboosting. You trim the setting until your get the best response and perfectly stable boost holding.

 

[aidan]

i heard if ya have an adjustable cam gear can bring the power band on earlier and reach full boost earlier any truth to this

 

[spudep91]

It' also worth mentioning before adjusting and testing these settings be sure to have your boost warning set for at the most 1 psi higher than your max desired boost and set the unit to default back to 0% (wastegate spring pressure). This way if you're causing excessive spiking due to an overly aggressive gain setting the controller will prevent damaging from overboosting. You trim the setting until your get the best response and perfectly stable boost holding.

how much more rpms would this get u thanks. i have i vf28 and the boost spikes and gains i just turned of for simpel use lol. i get full boost bout 4500rpm

 

[Guye]

how much more rpms would this get u thanks. i have i vf28 and the boost spikes and gains i just turned of for simpel use lol. i get full boost bout 4500rpm

The improvement seen will vary from each setup and engine. For example, when I fitted my ct9/ct20 hybrid I was seeing 15psi by 2600rpm using just the boost adjustment. When I tinkered with and tested both the gain and set gain for a few hours I was able to get the same 15psi by 1100rpm, hold the 15psi stable until 8500rpm, with 10psi showing at just 1/8-1/4 throttle in all gears. Other members at the time using a similar setup reported similar results. While I'm sure it will make an improvement in spool up response, I cannot say how much improvement there would be. It's down to the user to take the time to experiment for the best results.

 

[spudep91]

thanks lad