Comp is on and WHOA, High EGT's

[Mactruck]

The Comp is on and now (after all this bombing )I have an EGT problem. I know, it's inevitable but that little HY35 has been doing a good job until now This problem occurs around level 3 on the open road. It's all dependent on how I run it but one time when I was passin a truck on level 4 I hit 1500 for a split second (Whoops) so I backed her down a little and EGT's were back to manageable.

With the DDII's, an EZ, straightpiped. EGT's never got above 1100 degrees. The comp is what pushed it over the edge



So now that I have an EGT problem, what do you guys think about a PDR HX35??? Does it really spool almost as fast as an HY??? And should I bump the exhaust to a 4" from my stock exhaust that's straight piped??? I may also have to change my intake. I don't think the small version of the BHAF is cutting it anymore and I'm thinking of an AFE or Scotty?



I think I know what I'm going to do. I'm just looking for an economical solution. The Comp was supposed to be the last Bomb for a while.

 

[JR2]

I have DD3's, an EZ and a Power Edge (edges fueling box) with a PDRHX35-12- 4"exhaust and love it. I will say that I can still get my egt over 1400 degress with everything turned on and if I tow anyting I have to turn off the fueling box. The PDRHX35 spools as well as the HY, maybe even better. Right now I am thinging about going to a 14cm housing on it or just getting a PSRHX40 or B1 to solve the egt probls.

 

[tntway]

hhmmmmmmmmmm......

hey kev... you know i'm no expert but i'm thinkin change the air filter and go see ted about a 4". i've been smoking quite a bit with the 275's and my comp on 1x5. any ideas? no loss of power so that kinda lets out a boost leak.

tim

 

[KatDiesel]

If 1400° is all you have seen... . then you haven't floored it yet? When you put it on level 3 or up you can prolly peg the EGT gauge if you want.



The PDR HX35 will help to a degree..... but you'll still be able to peg the gauge if you want.



You have to decide how to approach this. If you want to use all your upper levels for long periods of time you need an HX40 or bigger.

 

[Greg Boardman-RIP]

I have had my EGT guage pegged a number of times(100). That is 1500*WOT. I feel that if it comes back to normal temps as fast as it goes up it will be fine. I agree with Kat that an HX 40 or more is in our future. I loved my truck with the VA box and DDII's. I actually miss it that way. But there is nothing cooler than out running a 2002 Porche Carrera4 on the freeway. I am waiting for a turbo. From a friend of mine. He is waiting on a new one. HX 40 here I come. Now for the HX 35 Why? Guys that had them stock, Changed to a hx 40 or b1. B1 is just too much spending money for me. I also feel that it isn't all that great of a turbo or KK wouldn't be looking so hard for a replacement. Remeber a big turbo with a small housing so it will spool faster means high egt's. I may be wrong here but from what I have read here 1500* is not uncommon with even a mighty B1. Greg

 

[KatDiesel]

Originally posted by Greg Boardman

I also feel that it isn't all that great of a turbo or KK wouldn't be looking so hard for a replacement. Remeber a big turbo with a small housing so it will spool faster means high egt's. I may be wrong here but from what I have read here 1500* is not uncommon with even a mighty B1.

Hes not really looking for a replacement. Hes just looking to improve on it. For a single turbo the B1 does a pretty decent job. Temps, I could still see 1500 to 1600 but it would immeditaly fall back... . and i couldn't peg the gauge anymore.

 

[Greg Boardman-RIP]

Kat,

A while back we were discussing a new KK turbo. I think it was the at 4. Did you ever run it? I am still waiting/looking for the right one for me. With 4. 10's I don't think lag will be as much of a problem. The HX 40 looks to be the way for me, What do you think?

 

[KatDiesel]

Originally posted by Greg Boardman

Kat,

A while back we were discussing a new KK turbo. I think it was the at 4. Did you ever run it? I am still waiting/looking for the right one for me. With 4. 10's I don't think lag will be as much of a problem. The HX 40 looks to be the way for me, What do you think?

well I have it on my truck still. It spools fast but the temps are not as low as with the B1. I'm going to be installing a backpressure gauge soon so I can better measure turbo changes. I am trying to get this combination to a track around here. I sled pulled with this one. . and then drag raced sunday... so it seems to be holding up. It might make a nice replacement for HX40.



I would wait a lil bit... and see what happens with Kurts testing... . but the PDR HX40 is a good choice as well... if your afraid of the B1 being too big.

 

[Greg Boardman-RIP]

Did you say afraid of it being too big???????Just kidding. Not that it is too big but I have to take into account that my wife will be taking the horses and trailer on weekend juants. I send her out on levels 1x1 and 2x2 only. B1 would be a little slow there, Right?

So Maybe I could trade her in for a B1 and bigger injectors... ... ... ... ... ..... yea thats it. Greg

 

[Mactruck]

What I'm trying to accomplish is to get my EGT's in check. With an HX40, Around the town type driving would be annoying with the lag I may experience (3. 54's). I am also worried about the track record of the 40's in relation to failures. A PDR HX35 seems a viable solution by being able to accomplish good spoolup as well as EGT reduction. I know I'll still peg the gauge if I want too but any reduction would make the truck (and the Comp) more useable.

I am also planning on utilizing the 14cm housing with the wastegate set at 35psi. This I believe, will be an improvement over my HY35 9cm and it seems by what I've read here, upgrading to an HX35 with a 12 just doesn't seem to be able to reduce the EGT's as much. Everyones big worry is lag and by utilizing the PDR version, the lag may be reduced more than a standard HX. Enough to make it tolerable.

I have considered a B1 but as I said before, I'm trying to stay economical. I think it's a great turbo but I also think it would be overkill for my uses. It also looks like I'll be getting a two month old PDR HX35 turbo from a fellow TDR member who is upgrading to a B1

In terms of Intakes I think the AFE filters have the best airflow. I would like to get one of those Airbulldog hoods. The design of utilizing Ram type air to feed the motor seems to be the best way to reduce EGT's. However price is a factor. BTW does anyone have their website???

I'm going to wait on a 4" exhaust upgrade until I address the turbo. I just don't think for money spent that I can get alot of EGT reduction from it (especially with my present system thats straightpiped )



Kevin

 

[Greg Boardman-RIP]

Mac,

I see where you are comming from. The HX35 is what I wanted at first but after the experts talked me into the 40 I think I am going with it. With the 35 you would see a drop of approx. 150* in egt's and with a 40 you can see 200-250*. I too worry about spool up times. With the HY turbos we have it is almost instant(no lag) I have driven a truck with a HX40 and the spool up takes only 1 second longer than my truck. Now to the air filter.

I have run the BHAF K&N and stock all in the same day, same hour, and on the same hill 7% grade. I found that the only change in egt's I got were with the stock box replaced, and a K&N

stock replacement filter was about 55-75* cooler on WOT runs up hill. Around town they are the same. Bhaf was 25* warmer than stock box and 50* warmer than 0880 K&N. The AFE only lets 25 more CFM's than the stock w/K&N and that is what I am running now. Hope this helps. Greg

 

[Mactruck]

I learned alot about airflow this saturday. I also learned my Comp is hiccuping. Darn thing caused my truck to pop and send smoke signals on the dyno. I'll be calling to get it replaced.

NOW (based on people I talked to at the dyno) I'm thinking of getting a Piers Modified HX40! Anybody have any experience with these? I figure because of my HY35, If I got a PDR 35 that the purchase of a 40 will not cost that much more because of the additional purchase of a housing required for a 35. I also heard his 40 spools like an hx35.

I pulled 380 RWHP and 805 ft lbs of torque at the dyno this weekend on a loaner Comp which (according to Piers) puts me in an HX40 class.



Comments?

 

[Greg Boardman-RIP]

Go with the HX 40. I have a DD one coming this month. My comp does the same thing. They(edge) say they have it figured out. I am on my third box. New one is in the mail as we speak. Let us know how you like the Piers HX. . Greg