Tuned IDI vs VR6.

[vwroadkill]

I would believe your 92 vrado is a 2.9l...awesome engine... 2.8's have some of the grunt of yours but, 2.9's they just haul the mail
my last car was a conversion.. 2.8 in a cabrio..cinnabar... I put the 268s in it and had some head work done.. it still got 24mpg on the highway cruising..70 to 75 mph..at 60 to 65 it got maybe 25 to 26..
I still think a tuned diesel is the way to go

[jaed_43725]

I will have to get my tranny model later as its been raining here. First thanks for the VR6 info. I have a K14 turbo, the pump has been worked by Chason Diesel in Garner NC, 2.5" straight pipe, and improved the intake a bit. There is a guy working on a fuel pin to help with the higher RPM's and I am on the trial list. Maybe that will make the difference. But as of now I am thinking VR6. My issue is that I often have to pass morons on the way to work or school. Most of the time they are doing 45-50 mph in a 55. So by the time I get to 65-70 mph my car is out of steam and running like 3600 rpm. Fuel mileage is of course a concern, but 25 or so mpg highway for a few days a week isnt bad. Especially if I can pass people.

[vanbcguy]

You REALLY shouldn't be having issues with passing people at those speeds. There is definitely something not right.

Do you have much smoke? Have you tried turning the max fuel screw in a touch?

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[745 turbogreasel]

So by the time I get to 65-70 mph my car is out of steam and running like 3600 rpm.

Something is wrong with it that stock parts would fix.  Fuel or air filter?

[Smoker]

I agree with everyone else... if you're having trouble at 70mph with a td, something is very wrong.  My bone stock n/a 1.6 (no gov mod or anything) in my Dasher cruises happily at 70-80mph.  Yes, it sounds like it's screaming at 80, but the idi's like the higher revs.

[Smoker]

And I like my VR's, too, but you're talking apples and oranges here.  Don't ditch your improperly set up td for a vr just because it's... well... improperly set up.

[jaed_43725]

OK. So my issue with higher speeds is that I have an ACH code tranny. (1st: 3.45 2nd:1.94 3rd:1.37 4th:1.03 5th:0.75 R&P:3.94) So that explains why my speedo is off and why at 60 mph it is revving well, and at 70 mph its way to high.

And I like my VR's, too, but you're talking apples and oranges here.  Don't ditch your improperly set up td for a vr just because it's... well... improperly set up.

My TD is properly setup. It actually pulls well until about 55 mph. Its making as much power as it really can without getting crazy. Plus power doesnt make you spin lower RPM's. And yes my fuel screw is turned in just a hair, my air filter is good, and my fuel filter is quite new.

If one of you guys was around me I would cruise over and you could check it out.

[theman53]

do you have a tach? If you are judging by the sound it makes then you could be thinking it is screaming but it really isn't.

[jaed_43725]

do you have a tach? If you are judging by the sound it makes then you could be thinking it is screaming but it really isn't.

Yes I do. It from what I can tell it is accurate. Its my tranny doing it. It has crappy gears. Someone once told me that they got the trannies mixed up. They put the gas ones in the diesel and vice versa. Realistically this is accurate. There is no reason a gasser should have a better highway gear setup than a TD. But they do.

[theman53]

The .75 5th gear and the 3.94 rp is not that bad at all. Actually I have an ags with a 3.67 rp and had the 3.94 installed before that and neither sound bad on the highway at even 90mph. I would see if it is your ears and tach messing with you.

Another question, do you have a gov. mod done? If not I could see your idea that it loses its punch in the higher rpm, especially if it is an older pump and doesn't have the pressure internally it used to.

[jaed_43725]

Yes my governor is modded. Its pushed so far back that I will never be able to get to it. I would never try to go to 90 in that thing. It would be like 4K+ rpm's. Getting up in the revs isnt bad if you are about to shift. But holding steady is a no no. I am gonna contact the guy back about the fuel pin. If that works then it will make a huge diff. But if it doesnt then I am going to start looking for a better tranny or a VR6.

I suppose I could try some propane injection. But this engine is tapped out on power for the most part.

[Jaceb-GLI]

There is something wrong with your car...my 4.25 ring and pinion doesn't keep me from hitting 100 mph. Someone needs to go drive this thing. My ECO has no issues passing people what-so-ever.

I also wish the VRad was a 2.9 but it's just a US-spec'r

[TylerDurden]

I'm with the choir... somethin ain't right. Not just the fuel pin.

(Unless there's is missing info, like 10" wheels.)

[theman53]

Either you have a non stock or a not equivalent to stock sized tire or your RPM is wrong on the tach. At a 1:1 ratio, which would be close to your 4th gear at 1.03, with stock tires, and 70mph you should be right at 4,000 rpm. In the .75 fifth you should be right around 3,200 rpm...if I calculated correctly. At any rate, around 3,200 rpm in 5th your car will probably not have much get up and go. You should try shifting and seeing if you can get a laser tach or something to check its accuracy.

This is another reason I have always preferred a bigger turbo. If you are pushing the k14 past 14psi non intercooled you are hurting your power as opposed to making more, especially in the higher rpm ranges. The turbo being a smaller one could be the reason it sounds like it is coming apart at higher rpm.

I am in no way saying that a diesel will out perform a good running vr6 but it should hold its own.

[RabbitJockey]

Either you have a non stock or a not equivalent to stock sized tire or your RPM is wrong on the tach. At a 1:1 ratio, which would be close to your 4th gear at 1.03, with stock tires, and 70mph you should be right at 4,000 rpm. In the .75 fifth you should be right around 3,200 rpm...if I calculated correctly. At any rate, around 3,200 rpm in 5th your car will probably not have much get up and go. You should try shifting and seeing if you can get a laser tach or something to check its accuracy.

This is another reason I have always preferred a bigger turbo. If you are pushing the k14 past 14psi non intercooled you are hurting your power as opposed to making more, especially in the higher rpm ranges. The turbo being a smaller one could be the reason it sounds like it is coming apart at higher rpm.

I am in no way saying that a diesel will out perform a good running vr6 but it should hold its own.

i was thinking that too, a k14, especially if its from an ecodiesel running at 22 psi with a tweaked pump isn't doing much good, but i would still think you'd easily be able to go faster than 70mph, i still think there has to be something wrong, winding out passed 4k shouldn't be a big deal