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What HP can I expect with a Z6 and 7psi from a TD04Hl 13G
I believe the integrated wastegate opens at 7PSI, and i'm trying to figure out what sorta HP/torque i'll get out of this. I'm using the car for driving school, so I don't wanna max out the stock Z6 right away. I'll periodically raise the HP as budget and mastery permits. This is whats making me want to leave the wastegate at 7psi instead of raising it to whatever the Z6 can handle.
Although this isn't my first powerful car, it is a perfect oppertunity to refine and even perfect my technique utilizing my economical recreation of the best handling FWD car ever.
Re: What HP can I expect with a Z6 and 7psi from a TD04Hl 13G
Well, You will need plumbing, an intercooler, exhaust manifold, etc.
To achieve 180-190HP you may replace your injectors, or at least set the fuel rail pressure a bit high. Also you need to modify the ECU, not only add fuel on boost but retard timing.
Re: What HP can I expect with a Z6 and 7psi from a TD04Hl 13G
It's a TD04L, not a TD04H. Two different turbos.
The 13g compressor wheel is physically capable of around 25.5lb/min at its choke limit. Keep in mind that is representative of crank hp. So by the time you factor in power train losses, compressor efficiency, etc the compressor side could yield 220-230whp which is ironically right at the "safe" limit for stock rods.
But that doesn't take the turbine side into account. The TD04L turbine wheel is small and this particular application puts in a .55ar T25 flanged turbine housing IIRC. If i had to guess I would say it might get you into the 200s. Remember that most Honda engines are far more efficient than most other companies offerings so you can't compare the two evenly. Also remember that when the OEM sized this turbo they were looking for low end and midrange torque in addition to fuel economy, not outright power production
If you gasket matched and ported the turbine housing, paired it with a decent turbo manifold, and an efficient and properly sized intercooler, piping, and exhaust you could easily reach the limits of the turbo safely on stock internals but it will take more than 7psi.
7psi is a pressure ratio of 1.48. This puts you at the very bottom of the map and way too close to both the surge and choke lines. At a PR of 1.4 the map ends at roughly 260CFM or right under 18lb/min (17.94) so you might be lucky to make 165whp. The turbocharger has the best map width at a pressure ratio of 2.2 (17.4psi). This is still quite reasonable on stock internals with a proper tune assuming the engine is healthy.
Also remember that as pressure increases so does torque output. At 7psi torque gains will be meh, at 17.4 you'll make considerably more torque. You could keep raising pressure over the 17psi mark but then you're getting into diminishing returns. While torque would increase the compressor outlet temps would start to get high due to decreased efficiency and you would start to see overall power production taper off faster and likely you would see boost levels taper due to the engine demanding more air than the turbocharger can supply at high pressure levels.
Re: What HP can I expect with a Z6 and 7psi from a TD04Hl 13G
I have run a volvo tdo4 11c that comes off the old 240 volvo it spooled real quick but kinda ran our of power after 6k at 6.5 psi I dont know how much power it made but it wasn't to bad. It was hooked up to a d15b7 mini me y7 head
Re: What HP can I expect with a Z6 and 7psi from a TD04Hl 13G
True but I do have to stay relevant somehow. On the other hand I figured that since the OP wasn't very well versed in turbochargers 101 (and the fact that he PMd me asking for help then PMd me to say thanks afterwards) that just getting the information to him would make it easier for everyone involved and keep some of the trolling away.
Also I could just start editing Geis' posts to say whatever I want lol.
11-19-2015, 12:40 AM
What HP can I expect with a Z6 and 7psi from a TD04Hl 13G
but, Careful..
