Group Buy - 100 Series Headers

[moooooooo]

Moooo-


My response to your first post, is that K&N filters seem (from my reading) to have a problem with discharging a very very thin film of oil that can tamper with the MAF. Thusly, causing some issues with performance or reliability. I'm not too familiar with the MAF or sensors for intake but I do know them to be extremely sensitive and tricky.

An example, I had my airbox out for 6 hours last weekend during an HID conversion for the headlights. After putting the car back together I had serious problems with the LX470: it wouldn't stay running below 1,500rpm, it had trouble starting, it was kicking back several warning lights, etc.

Turns out there was some moisture buildup on the intake and airbox that caused one of the intake sensors to go screwy. It was temporary but how finicky is this? I live in California too so imagine 55 degrees and overcast giving your car problems.

My response to your second post: I'm definitely on the fence as to the value of buying a chip. I was really trying to help Brock see how the header upgrade, for me, should be part of something bigger and timed when the costs justify themselves a bit. Also, from my hot rodding days, I spoke about some of my knowledge regarding ECU's/chips and how to use them best. I was speaking more to the point of visiting a specialty shop. Such as a local tuner or something. No way do I think and Dealership will tune your car's electronics.

In general, it seems there's little that can be done to this motor to improve performance. What I see as options for me are one of only a couple things: a big bore rebuild when the motor dies (or when hell freeze over), a supercharger (if I'm lucky enough to find all the specs/parts to keep the costs reasonable - around $5k or less), or lastly upgrading several parts that, when combined, adds up to something more substantial (like headers, intake, ECU that's tuned after install).

I didnt address the MAF issue you mentioned when i replied.
I'll get that looked into.
Man my list is growing!!

I disagree about that there;s little that CAN be done to the motor to improve performance. My full performance exhaust i got fitted at 110,000 kms basically gave me a new car. Amazing result.

i still need to get mine dyno'd to show you before and after the exhaust upgrade, and then i;m fixing the air intake


You've got a few ppl over there that are doing just that. And just beacause they dont post on here, doesnt mean they dont know anything.

Remember the first Tundra over there had the 4.7 (non VVTi) and from what i know they raced them in your Truck Series (let me know if wrong) and then of course the 5.7 is out.
i think we need a 4.7L performance forum that we can post to. Because posting tidbits and tips in various threads whilst helpful, should be in one area. EDIT: because there will be people like me that want to get massive performace and some economy and some that want midrange of that.
And of course people that just want their beast to purr along nicely and ask questions when they have issues.
Woody?
cheers
peter

 

[uzj100]

Peter,

Merry Christmas!

Thanks for the well wishes. The headers are doing great.

It is hard to believe this happened. I guess bugging Nick almost everyday made him move and my man DesertRun who dropped off his LC. That was huge! Thanks again.

I cut a hole in my airbox based on research done on the TrundraSolutions board concerning back pressure. More air out requires more air in.

https://forum.ih8mud.com/100-series-cruisers/423500-air-pump-more-air-out-need-more-air.html

Merry Christmas and have a great new year!

Andrew

PS - Now I want a 5 speed manual, could you send yours over for me. ;<)

 

[smm3]

Thanks for the update. I think they have sold just under 40 sets of these, with no major complaints and lots of happy customers. For the $600 bucks I have to say this was a good deal, and a much better solution to the cracked header syndrome. I hope they continue to produce these, since I know it will be a problem for most if not all LC's in the future.

Nick said they were not discontinuing them. Just going to make them in smaller batches (like 10). Don't know about the price change though.

 

[smm3]

Peter,

Merry Christmas!

Thanks for the well wishes. The headers are doing great.

It is hard to believe this happened. I guess bugging Nick almost everyday made him move and my man DesertRun who dropped off his LC. That was huge! Thanks again.

I cut a hole in my airbox based on research done on the TrundraSolutions board concerning back pressure. More air out requires more air in.

https://forum.ih8mud.com/100-series-cruisers/423500-air-pump-more-air-out-need-more-air.html

Merry Christmas and have a great new year!

Andrew

PS - Now I want a 5 speed manual, could you send yours over for me. ;<)

Looking forward to this upgrade. Had about all of the ticking I can stand. thanks Andrew and DesertRun!!

 

[uzj100]

The ticking is what did it for me. Every morning it sounded like a old farm truck backing up. No more. Nice and quiet.

 

[FullyLitLED]

My hundy started ticking today...looked at the manifold and saw a crack...not sure if the ticking and fracture are related but told showed the mechanic...if manifold is the problem, HELLO DT HEADERS!

 

[moooooooo]

Peter,

PS - Now I want a 5 speed manual, could you send yours over for me. ;<)

my new years resolution is to once and for all get a f###ing video on youtube so you can see and hear "the beast" !!
I posted some pics in the pic thread going up a nice side track the other day, i'll see if i can get that video'd as it will sound awesome
cheers
peter

 

[SHAGGY101]

flow comparison test

I recently put the headers on my truck. We have a flow machine here at school and I decided to see what the difference in flow between the headers and manifolds were. The manifolds flowed at 249.3 cfm and the headers flowed at 386 cfm. Clearly the headers are much less restrictive! I was also going to perform a 2 wheel dyno in our lab but the schedule did not work out before I went home for Christmas (put the headers on at home). I could still perform a 2 wheel dyno with the headers on if you guys are interested, however, there would not be anything to compare it to. Let me know what you guys think or if you have any questions!

 

[lexi4darin]

 

[smm3]

For those that changed to the headers, did you buy new 02 sensors while doing the work? I called my local Toyota dealer and they said the pre-cat are air/fuel ratio and the post cat are the 02 sensors. I had planned to just replace the pre-cat sensors.

I haven't gotten a check engine light. I bought my LC with 138K and the timing belt hadn't been changed. I am assuming that the 02 sensors are original too. I now have 163K on it.

 

[OregonLC]

No need to replace early unless there's a problem.

Two items to note: 1) the sensors do get relo'd and consequently you'll need to re-route some of your wiring by removing the O2 sensor leads from the existing clips (search this thread) and 2) they will be in a slightly more difficult location to get to, probably will require a crow's foot (or stubby 22). I put anti-seize on the threads and didn't torque down very tight for this reason.

 

[smm3]

No need to replace early unless there's a problem.

Two items to note: 1) the sensors do get relo'd and consequently you'll need to re-route some of your wiring by removing the O2 sensor leads from the existing clips (search this thread) and 2) they will be in a slightly more difficult location to get to, probably will require a crow's foot (or stubby 22). I put anti-seize on the threads and didn't torque down very tight for this reason.

Thanks. I just thought it might save me some time in the future not having to go back in to replace them. Would cost me another 125 though in addition to the parts I am ordering to complete this project.

 

[OregonLC]

Are you getting the OEM Denso or the Bosch?

 

[smm3]

Are you getting the OEM Denso or the Bosch?

I was gonna get the Denso ones. I looked on Amazon as I thought this was the cheapest place to get them. I don't know if I am looking at the correct ones though. I have not been able to locate the different part #s for the pre and post cat sensors.

 

[hoser]

Denso part numbers here...

http://www.densoaftermarket.com/catalog/

 

[smm3]

Denso part numbers here...

DENSO Aftermarket Online Catalog | Vehicle Parts Search

Thanks Hoser. The front sensors are 55.46 each from Amazon. I think I am going to go ahead and replace the 2 front sensors so I don't have to go back in.

 

[hoser]

Big $$$ savings since the front O2 sensors are $163/ea from Toyota.

 

[smm3]

Big $$$ savings since the front O2 sensors are $163/ea from Toyota.

It sure was. Had it not been such a big discount, I might have waited till they failed to replace them.

 

[DesertRun]

I recently put the headers on my truck. We have a flow machine here at school and I decided to see what the difference in flow between the headers and manifolds were. The manifolds flowed at 249.3 cfm and the headers flowed at 386 cfm. Clearly the headers are much less restrictive! I was also going to perform a 2 wheel dyno in our lab but the schedule did not work out before I went home for Christmas (put the headers on at home). I could still perform a 2 wheel dyno with the headers on if you guys are interested, however, there would not be anything to compare it to. Let me know what you guys think or if you have any questions!

Thanks for going through the trouble to do the test. We all "think" we know the difference but what you tested shows just home much of an improvment there is. I think everyone on this thread would love to know what the dyno test shows. I know it is not scientific since you will not have a base line with the exact conditions (atmospheric) etc... but it would still be great info to compare to. I vote for you to do the dyno test!

Thanks

 

[SHAGGY101]

Thanks for going through the trouble to do the test. We all "think" we know the difference but what you tested shows just home much of an improvment there is. I think everyone on this thread would love to know what the dyno test shows. I know it is not scientific since you will not have a base line with the exact conditions (atmospheric) etc... but it would still be great info to compare to. I vote for you to do the dyno test!

Thanks

Thanks,

I guess I will be putting it on my calendar! I really enjoy this stuff. I almost enjoy it more than actually driving the truck...maybe. Or maybe I am just too big of a nerd! (mechanical engineer). Either way, i really enjoy the engineering side of everything.