Things not to do: 14B and 450s with the boost turned up.

[LandSpeed-DSM]

Because the topic came up tonight, I forget where..

I just went looking for some old logs from 2010 during break-in on a motor, where I slapped the old 14B to get her up and running as usual with new builds.

On a very cold night and a mere 90% TPS with only 20psi. Not on purpose mind you.. and boost est disagrees, this was on an abused stock 1G MAS.

Link shows 30.x lbs/min airflow and ~108% IDCs Which is not even the worst pull from the night. One of which spiked higher than that, and was nearly 120% IDC. (I am having difficulty finding these among several hundred logs from 2010 on several setups.)

See 49.33sec.

You must be logged in to view this image or video.

Needless to say that for 300whp, even on a FWD, at stock BFP you need more than 450cc injectors. I was lucky as hell nothing melted. I know what the boost was because the gauge had a peak hold function that let me check again, based on airflow and IAT we were able to determine the other runs were slightly less.

Somehow, it went unnoticed until after a series of pulls and we looked at the logs that I found the gate was catching on the housing for whatever reason and I realised how lucky we got. This was supposed to be only 17 max while we were playing with timing and tweaking the VE table.

 

[GsXdSmKingGsX]

..

 

[brian9397gsx]

Very lucky, I have 2 pistons from an old motor of mine that didn't agree with 18psi outta my 14b.

 

[LandSpeed-DSM]

With enough fuel those PRs are not a big deal, it does start to get inefficient after 20-21psi, but no worse than many superchargers. Provided backpressure on your setup isn't sky high.

I have lost a valve hitting fuel cut when a homemade boost controller failed, managed to somehow dump it out the wastegate and through the screamer pipe to atmosphere and save the turbine!

You must be logged in to view this image or video.

Still had to pull the head obviously.

For a good while on a 24x11x3.5" garrett IC with a 625cc meth nozzle at the TB I was moving 35.x lbs/min when spiking to 25psi and settling to 19psi at 8250.

That was on a different (older, back in ~2008 or so) big cam motor with a full port/polish/blend/knife-edging from a bored 1G TB all the through the head and out to the divider at the collector on the exhaust manifold.

 

[brian9397gsx]

Your 2 times lucky there, no I know 18psi is not to high I know it probably was an ignition timing issue or shitty top-line pistons, as it was not holes in the pistons but broken ring lands.

That was 7 or 8 years ago.

 

[LandSpeed-DSM]

Agh that's frustrating. What did the bores look like after?

If only we were that lucky all the time!

My friends SR20 swapped 240sx just shit the bed about a month back when it cracked the ring lands, scored the block something ugly and managed to chew the corner off the crown of cyl #4.

He of course didn't listen to his DSM friends warning him about the dreaded monster "Fuel Cut." We were the ones who made a boost junky though, so I guess in a way its our fault.

But you gotta learn somehow I suppose.

If you don't break stuff you're not trying hard enough?

I would like to think so at least, judging by the giant wall of shame we keep in a buddy's garage.

 

[brian9397gsx]

Yes the wall of shame, I have buckets of shame just sent alot of it in for scrap, needed the room . Had over 1000lbs of dsm junk. Trying to get out of hoarding useless parts.

Cylinder walls looked like crap, so I gambled and honed it tossed in new pistons and rings in it and still drive it today. Has good compression and leak down the marks were low down on the bores so its ok till I work up the motivation or necessity to put my built block together. You can check my mods it gets pushed every now and then.

Yeah when I look back at all the heads and trannies Ive gone through I just laugh. Outta the 6 or 7 of my friends that had E\T\L's myself and my other good buddy are the only ones who held true. Been a good 10 yrs or really bad

 

[clipto]

I know how that goes.I remember when I had my 14b at about 15psi with 550cc I was runing at 70% idc, crazy you runing those 450's so high.

 

[LandSpeed-DSM]

Ya live and learn, huh? Almost every year I will still put one of 14Bs (one in 6cm2 and one 7cm2) back on just for fun, usually when switching setups.

Hoping to stick with this one for a while, since I am down to only one DSM now sadly.

It's fun driving a slow car fast occasionally. It should a good laugh when the time comes and I switch from the twinscroll T4 HX52 back to the good ol' 14B. Maybe at the end of the season.

I always keep my oil lines, J-pipe, eBay MHI tube mani, dumped 3" o2 housing and 3" 2-bolt down pipe handy for just such occasions.

 

[clipto]

Hey, there is nothing wrong with a little 14b love.

 

[gsxeclipse97]

You did this on a stock fuel pump? I have mine set at 15psi but I have an evo9 fuel pump rewired.

 

[LandSpeed-DSM]

No this was with a 255HP in tank feeding an 044 through an -8AN feedline from the tank to rail with a Golan SS fuel filter and an -8AN bung on the rail. But at stock 38psi BFP per an Aeromotive AFPR.

This would've been absolutely disastrous on the stock filter/banjo bolt and stock pump non-rewired.

The 450s, 1G MAS and 14B were installed for break-in and base tuning convenience before this motor had an S200sx 59-74 strapped to it.

In fact the big ass FMIC and cold IATs also likely played a huge role in keeping this motor in one piece. And she is still running strong in the Laser I sold to a friend a few months back.

 

[Lofty]

My car must have been a freak, I would log 15psi in summer on my 14b, it would never go past 80%IDC.

In the winter, it was turned down, but I maybe hit fuel cut...once?



That is CRAZY IDC's

 

[LandSpeed-DSM]

That was at night in the middle of winter on a pretty efficient setup at 20+ psi, airflow was pretty high and I was running pretty fat as a safety measure.

WB wasn't logged at the time for whatever reason, but if I remember that would've been in the neighborhood of 10.5-11.0:1 or so knowing me trying to be relatively conservative.

 

[gsxeclipse97]

This almost concerns me here. Makes me think I should turn the boost down some. But you are on a 1g head and that makes a difference. I have no creep issues at all on my current set up. But my base fuel pressure is higher.

 

[LandSpeed-DSM]

Replace the banjo fitting on the stock filter and snag yourself one of the -6 or -8AN rail adapters and you'll likely be fine. Provided you made sure to rewire your IX pump.

For me the biggest difference was getting rid of the stock line between the pump and rail.

I would get rid of the filter to but at that point you might as well just do a full tank to rail setup, and that can get pricey.

The affordable, effective "band-aid" solution is to delete the banjo fitting.

 

[H@xtGSX]

....*grumble*.... Stupid banjo bolts.....

 

[LandSpeed-DSM]

Agreed.

 

[MoreGripLesSLiP]

Woah! the valve came out of the wastegate?! lucky....