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Search found 874 matches

by nitro2
Mon May 03, 2021 6:39 pm
Forum: General Tech
Topic: Bristol: NASCAR on Dirt
Replies: 3
Views: 228

Re: Bristol: NASCAR on Dirt

Best thing about Bristol (March and April) was seeing just how slow Cup cars were, compared to all the rest of the racecars there (i.e. cars/drivers that Joe Average has seen many times at a local or local(ish) track).
by nitro2
Wed Apr 28, 2021 6:22 pm
Forum: Electric & Hybrid Vehicle ** NEW **
Topic: Who here actually drives an EV/HYBRID?
Replies: 88
Views: 6850

Re: Who here actually drives an EV/HYBRID?

The internet is full of EV "channels" but it doesn't need to be "US vs THEM". There are a lot of racers, tuners etc who are interested in where EV tech is going and want to discuss it with like minded folk. These people have "done it right" they "have their own channel" . It is called "Electric & H...
by nitro2
Tue Apr 27, 2021 10:43 am
Forum: Electric & Hybrid Vehicle ** NEW **
Topic: Who here actually drives an EV/HYBRID?
Replies: 88
Views: 6850

Re: Who here actually drives an EV/HYBRID?

It boggles my mind how an EV section is even allowed to exist on ST, and doubly so regarding those that defend it's existence on here. 0-60 in under three seconds from the top of the line Teslas isn't worthy of ST? The canvas may change but hot rodding as an art is forever. The new crop of EV truck...
by nitro2
Mon Apr 19, 2021 4:12 pm
Forum: Electric & Hybrid Vehicle ** NEW **
Topic: Who here actually drives an EV/HYBRID?
Replies: 88
Views: 6850

Re: Who here actually drives an EV/HYBRID?

It boggles my mind how an EV section is even allowed to exist on ST, and doubly so regarding those that defend it's existence on here.
by nitro2
Wed Mar 31, 2021 1:38 pm
Forum: Engine Tech
Topic: Engine Tuning - Intake/Exhaust Tuning Using Port Pressures
Replies: 28
Views: 1286

Re: Engine Tuning - Intake/Exhaust Tuning Using Port Pressures

Speaking of tough, I'm finding it challenging to parse that reply... :-k :) Diverging a bit, the slow drift down in VE with increasing revs indicates that nothing (head, intake, exhaust) has run up against a brick wall, there is more to be had at higher revs with the right changes using essentially...
by nitro2
Tue Mar 30, 2021 3:22 pm
Forum: Engine Tech
Topic: Engine Tuning - Intake/Exhaust Tuning Using Port Pressures
Replies: 28
Views: 1286

Re: Engine Tuning - Intake/Exhaust Tuning Using Port Pressures

No, I meant that given the typically narrower 'tune band' for the intake system (and depending of course on the operational requirements, e.g. 5 speed vs Powergilde) it might be beneficial to have the intake length optimized for mid-range and the exhaust for peak or near-peak power. You're making i...
by nitro2
Tue Mar 30, 2021 10:11 am
Forum: Engine Tech
Topic: Engine Tuning - Intake/Exhaust Tuning Using Port Pressures
Replies: 28
Views: 1286

Re: Engine Tuning - Intake/Exhaust Tuning Using Port Pressures

It appears that the exhaust 'optimum tune' RPM is ~ 6,000 whereas the intake is more like 7,000+ Since the 'window' for the former is much wider, I'd expect for most applications that reversing the tune ranges would yield more peak power and a wider band[/list] The exhaust tuning range is a non-iss...
by nitro2
Tue Mar 30, 2021 10:06 am
Forum: Engine Tech
Topic: Engine Tuning - Intake/Exhaust Tuning Using Port Pressures
Replies: 28
Views: 1286

Re: Engine Tuning - Intake/Exhaust Tuning Using Port Pressures

CYL 1 - VE vs RPM (as determined from cylinder pressure)

NA 355 ci - Cyl 1 - VE vs RPM.jpg
by nitro2
Mon Mar 29, 2021 5:33 pm
Forum: Engine Tech
Topic: Engine Tuning - Intake/Exhaust Tuning Using Port Pressures
Replies: 28
Views: 1286

Re: Engine Tuning - Intake/Exhaust Tuning Using Port Pressures

...Any comments or questions about the traces ?... Great to get the story 'straight from the horse's mouth' Clint! Skipping by all posts subsequent to the above quoted one (to avoid confusing myself with facts): It appears that the exhaust 'optimum tune' RPM is ~ 6,000 whereas the intake is more li...
by nitro2
Wed Mar 24, 2021 2:54 pm
Forum: Engine Tech
Topic: 13100 rpm fourbanger restricted to 9300 redline
Replies: 59
Views: 1871

Re: 13100 rpm fourbanger restricted to 9300 redline

The exhaust is modified stock exhaust. With extra time and money, a full custom exhaust could be made from scratch. The chassis is different from a motorcycle chassis so there’s some obvious improvements one could make, beyond just lengths and diameters. I'd toss that exhaust in the garbage, the OE...
by nitro2
Tue Mar 23, 2021 8:26 pm
Forum: Engine Tech
Topic: Engine Tuning - Intake/Exhaust Tuning Using Port Pressures
Replies: 28
Views: 1286

Re: Engine Tuning - Intake/Exhaust Tuning Using Port Pressures

Seems like a fairly large suction wave magnitude, I thought 0.5b would be more likely 0.5 bar (7.25 psi) suction would be a mediocre exhaust suction. The exhaust suction magnitude for this engine was pretty good, but I've seen better. The magnitude of the exhaust pressure peak during blowdown is fa...
by nitro2
Mon Mar 22, 2021 9:09 am
Forum: Engine Tech
Topic: Engine Tuning - Intake/Exhaust Tuning Using Port Pressures
Replies: 28
Views: 1286

Re: Engine Tuning - Intake/Exhaust Tuning Using Port Pressures

This thread, at least at the start, goes along with the Engine Tuning - In Cylinder Pressure - Naturally Aspirated thread, in that the intake and exhaust port pressures (pressure wave tuning) are shown for the 8000 rpm 355 ci NA engine discussed in that thread. The data being shown is for the conve...
by nitro2
Mon Mar 22, 2021 9:01 am
Forum: Engine Tech
Topic: 13100 rpm fourbanger restricted to 9300 redline
Replies: 59
Views: 1871

Re: 13100 rpm fourbanger restricted to 9300 redline

The factory 4-2-1 has a positive pressure pulse in the exhaust port for most of the overlap period over the entire rpm range the OP is interested in. Couldn't be much worse. The main change they did in the first round of changes was a new exhaust better suited for this rpm range and power level and...
by nitro2
Mon Mar 22, 2021 8:47 am
Forum: Engine Tech
Topic: TFX Question for Nitro
Replies: 14
Views: 726

Re: TFX Question for Nitro

Nitro, I am interested in recording a single pulse in an exhaust pipe. I am thinking of using a 22 cartridge in a nail gun connected to the start end of the duct. Do you have any experience with doing this? Do you know if the exhaust sensors can handle that kind of pulse in a duct diameter from 1" ...
by nitro2
Sat Mar 20, 2021 4:18 pm
Forum: Engine Tech
Topic: 13100 rpm fourbanger restricted to 9300 redline
Replies: 59
Views: 1871

Re: 13100 rpm fourbanger restricted to 9300 redline

Does this engine have rocker arms? Would there be some way to modify a rocker to change the lift? Direct acting bucket lifter. More lash will reduce duration. I wonder how much low lift glow one could kill simply by “repairing” the valve job within the instructions of the factory service manual? 45...