As the title says i have a 93 ex coupe. I have a dyno appointment next week. But in the mean time she won't rev past 5k in 2nd at wot but will if you roll on the throttle. I have bkr7es gapped at .025. Perhaps a timing issue? It boost fine in 1st and at partial throttle responds great. It's only on the 7psi spring. Any help with be great guys.

D16z6
440cc injectors
Xenocron basemap
Td04
Tial wastegate
Full 3in exhaust
Skunk2 68mm tb

 

Why not go ahead and wait until tune day? Sounds like Boost cut of some sort..

That's your best bet.

 

It definitely sounds like boost cut. Do you have a boost gauge hooked up? Call Xenocron and ask them if they set a boost cut, and what they set it to.

 

Good ol Xenocron with their idiot proof boost cuts!

 

lol I'm not attempting to smash on it. simply making sure it's running properly. You see idiots smashing the rev limiter doing burnouts on YouTube I've only driven it twice to check for oil coolant leaks. I suppose it's possible it's a boost cut in the chip but it pulls 7psi solid in 1st and will in 2nd at partial throttle. I was think possibly a tps or timing issue. Ive boosted 2 cars and both were on the early 2000s with stock injectors and an fmu with a missing link on the map and though it was years ago I swear they seemed to pull better. I guess we'll see what happens Tuesday on the dyno

 

You say it pulls 7 PSI, but do you have a boost gauge to verify that? Just because it has a 7 pound spring doesn't mean it isn't creeping. I'm fairly sure Xeno puts a 10PSI cut in all of their basemaps...

Hey man, if it keeps people from thinking a basemap is a tune and blowing up their motor, I'm all for it.

 

Yeah I have a boost gauge. It seems to be between 7-10psi I'm running the wastegate off the manifold since my compressor housing is nipple less. So it's probably closer to 10psi. That could definitely be the issue.

 

Yes. a lot of us did then. but didn't have the technology to create safety features to keep you from doing what you're trying to do. Back then, there were no "basemaps", and one could easily only go so far as the missing link check valve.

But not with basemaps. They like to help prevent the idiocy from people that want to "smash" on it, even slowly.

Its not an "issue" with the car. Just go to the dyno and let them do their job. No more testing and "pulls"...Unless you really want to damage something, but that's your call.

/thread.

 

There ya go.

Get the car properly tuned and set up, and run the wastegate off a non-vacuum source and you should be fine. Just because your turbo doesn't have a nipple (dafuq kind of turbo doesn't have a boost nipple?) doesn't stop you from welding one into your charge piping.

 

it's an emusa td04 seems to be a pretty good snail for the price. but yeah it's doesn't have a nipple I'm going to change the charge piping to hard pipes and weld one in. I'm debating on investing in hondata to toy with in the future. but thanks for the replies guys. I was attempting not to sound like an 18yr old Honda-tool complaining about my basemap. Just was unsure about it. I'll throw some numbers up next week. we're going to run crome and aiming for around 210 on 10psi.

 

Actually, a good majority of Garrett and Borg-Warner turbochargers do not have them; only locations where one can put one in as an option. Honestly, none of the turbochargers I use have one, because although its a good boost reference, its one of the main reasons why people get "boost creep". Using the Intake manifold as a boost reference source is just fine, and doesn't even need to be in the charge piping.

 

If nothing else, it'll be at least... interesting.

Good luck to you, sir.

 

Aha, Chinacharger. That makes sense.

 

Yea they put a boost cut on their basemaps to save the motor until it is tuned.

even though you have a 10psi spring it isn't exact, it could be making anywhere between 10-11psi, the map sensor reads exact pressure and if it's anything over 10.00psi you hit boost cut. I also think xenocron had started putting a lower rev limit in their basemaps just so you can't beat on the car.

also the stock map sensor only reads to 10-11psi so that's your other issue, you're pegging out the map sensor and the ecu doesn't like it. you need a bigger map sensor if you're going to run 10psi or higher...

and good luck with the Chinese turbo, you're going to have nothing but issues and you'll be replacing it (and any Chinese component included with the kit) much sooner than you think

 

Also, what's your complete setup? ie everything turbo, motor, fuel, ignition, and tuning related.

do you have an upgraded fuel pump? a walbro 255 is the bare minimum.. if not don't drive the car in boost or at all. the stock pump cannot support that much power

do you have a wideband? the car is on a basemap which is meant only to start the car to check for leaks and proper operation and to give the tuner a starting point... under no circumstances is meant to be driven on, muchless to beat on the car.

it could be running so lean or rich that it's causing your issues. you could have already damaged the motor, severely. with no way to monitor air fuel ratios you really have no idea what is happening.

 

While the rest of what you said is completely spot on...wat? A stock Civic pump can easily support 200 with 440's, and on stock pressure to boot.

 

I thought the intake manifold wasn't the proper place for the wastegate line as it is a vacuum source (and not a constant boost source) when the throttle is closed which can damage the wastegate's diaphragm. I remember reading a post directly from Tial about this here on HT.

My Garrett GT2871R is also one that doesn't have a nipple on the turbo so I'm interested in this as well. I figured either an ATP charge pipe coupler with nipple would work (no welding required) or taping the charge pipe was the way to go.

Feel free to correct me as, again, I'm interested for my build as well.

Edit: Another thought/question. I was also under the impression that wastegate creep/slower response was more prone when tapping after the intercooler.

 

this is true but it's pretty much at its limit at that point, so you don't have any safety margin. Combine that with the typical age of an OEM pump and then you see spending 80 bucks on a walbro isn't a big deal.

 

my car has the same problem actually. if I roll into it there is no issue but wot it cuts at almost exactly 5k no matter the gear im in. I tuned it myself....its on ectune and 16 psi springs in the wastegates. also running a dualstage boost controller, on low setting is 18psi. it has 27psi boost cut since high boost is 25psi. randomly started doing it last fall, until then it never happened, so its not a "new build" issue, more of a something happened and idk...oil pressure is good also

been trying to track it down. so far

replaced:
ignitor
coil
junkyard dizzy
plugs....twice
engine harness
new alt
new battery

so far no dice

it cuts out at 5k could be 5psi could be 20psi so it has nothing to do with psi level or map reading from what I can tell

I have to grab a new wb02 sensor before I go any father as it crapped out on me....im also running way to little timing and racefuel so I know for a fact its not knock



also best boost reference for the wastegate is on the charge piping right by the throttle body. that will give a fairly accurate reading of whats entering the tb and accounting for pressure loss throughout the chargepipe and intercooler. the vacuum isn't the best for wastegates either which makes the i.m. less than ideal. the nipple on the turbo does not cause boost creep at all. quite the opposite it causes boost to fall off in the upper rpms at full boost, this is more prevalent in smaller turbos like the gt28's

 

Well. I hope the best of luck to you, then as obviously you're able to solve these boost issues.. but as a boost reference source, manifold does just fine without compressor "nipple".

 

That's cool and all...but your issue and OP's issue are most definitely not related. You've been around long enough to know that thread jacking is bad.

 

Mine dose same thing, 5k starts coughin and bak fireing but only wen i accel quick, if i eas onto accel then it boost fine, im running a microtech lt8s and boost cut off is set at 14psi, im thinkin fuel supply or timing? I got bigger injectors and pump? U think it could be blocked injectors or filter? Turbo seals or actuator? Its got me scratchin me head any ideas?????

 

wasn't thread jacking at all. I gave my input on a specific topic that was brought up as well as a 100% relatable issue. the ops symptoms coinside with the symptoms I currently have. just because its easy to point a finger at his base map and assume that's the cause isn't a fix for his issue. he said he had a 7# spring. I dought he is spikeing to boost cut....that would be nearly double what his spring is rated for. sounds to me like the op may have the same issue I do,b ut then again unrealated as we bot hhave a turbo d16 that will not rev out at wot but will rev out just fine rolling into high rpms at part throttle...your right our issues do seem unrelated. I have posted what I did thus far to rule out possible causes to both help the op as well as myself to finding out what the root issue is.

I hope the op continues to trouble shoot his issue and doesn't think his problems will just disappear on there own